Fudgy Cookies and Cream Brownies

Are you ready to transform a simple boxed brownie mix into an extraordinary dessert masterpiece? These Cookies and Cream Brownies are not just brownies; they are an experience. Imagine rich, fudgy brownies infused with crushed Oreo cookies, generously topped with a dreamy marshmallow frosting, and finished with a decadent drizzle of homemade fudge sauce. This recipe takes convenience to a new level by utilizing a boxed brownie mix, ensuring an easy yet incredibly impressive treat that will captivate any dessert lover.

This isn’t just another brownie recipe; it’s the ultimate homage to the beloved cookies and cream flavor. Every bite delivers a symphony of textures and tastes, from the soft, moist brownie base to the creamy, sweet frosting and the satisfying crunch of Oreo pieces. Whether you’re a seasoned baker or just starting, these brownies are designed to be simple to make and impossible to resist.

Obsessed with Cookies and Cream? Dive deeper into this iconic flavor with these other delightful treats: explore our Cookies and Cream Cupcakes, classic Cookies and Cream Cookies, fun Monkey Bread, addictive Popcorn, or delightful Donuts.

Why These Cookies and Cream Brownies Will Be Your New Favorite

If you’ve been searching for the definitive Oreo brownie recipe, your quest ends here! These brownies are a celebration of all things cookies and cream, crafted to deliver maximum flavor with minimal fuss. What makes them truly special?

• Unbeatable Oreo Integration: The magic begins with Oreos baked directly into the brownie batter. As they bake, these cookies transform into wonderfully soft pockets of chocolatey creaminess, blending seamlessly with the moist, fudgy brownie base. Every forkful guarantees that iconic Oreo crunch and flavor without being overly hard.
• Fluffy Marshmallow Dream Frosting: Forget basic buttercream! A generous layer of homemade marshmallow fluff frosting crowns these brownies. It’s incredibly light, sweet, and perfectly complements the rich chocolate of the brownie, evoking the creamy center of an Oreo. We even sprinkle extra chopped Oreo cookies on top for added texture and visual appeal.
• Irresistible Fudge Drizzle: To push these brownies into “ultimate” territory, a simple yet luxurious fudge sauce is drizzled over the marshmallow frosting. This quick, glossy chocolate topping adds another layer of decadent flavor and a beautiful finish, making each square look and taste professionally made.

I initially experimented with these cookies and cream brownies in a 12-inch foil pizza pan for a unique, shareable shape, which requires a few more Oreos for complete coverage. While a pizza pan creates a fun presentation, I’ve standardized this recipe for a classic 9×13-inch pan to ensure consistent results and ease of preparation for everyone. Both methods yield incredible brownies, so feel free to choose your adventure! Regardless of the pan, you’re guaranteed a dessert where every single bite is bursting with delightful Oreo goodness.

Still need a little more persuasion? You’ll also adore these Cookies and Cream Brownies because they are:

• Effortlessly Easy to Make: The cornerstone of this recipe is a convenient box of brownie mix. Paired with a package of Oreos and a few other pantry staples, you can whip up these sensational brownies without any complex techniques or lengthy preparation. It’s the perfect recipe for when you need a show-stopping dessert but are short on time.
• A Chocolate Lover’s Dream: From the deep, rich notes of the dark chocolate brownies to the smooth, luxurious quick fudge topping, this dessert is designed to appease even the most intense chocolate cravings. The black cocoa of the Oreos further amplifies the chocolate experience.
• Sweet, Creamy, and Comforting: If the sweet, nostalgic taste of marshmallows brings you joy, then the exquisite marshmallow creme in our fluffy frosting will be an absolute delight. It’s perfectly balanced with the chocolate, offering a creamy counterpoint that makes these brownies truly special.
• Perfect for Any Occasion: Whether it’s a birthday party, a casual get-together, a potluck, or just a treat for yourself, these brownies are always a hit. Their familiar yet elevated flavor profile makes them universally appealing and a guaranteed crowd-pleaser.
• Visually Stunning: The layers of dark brownie, white frosting, scattered Oreo pieces, and a glossy fudge drizzle create a visually appealing dessert that looks much more complicated to make than it actually is. They are sure to impress!

Essential Ingredients for Your Ultimate Oreo Brownies

Crafting these incredible Cookies and Cream Brownies requires a thoughtful selection of ingredients, ensuring each component contributes to the overall exquisite flavor and texture. Here’s a detailed look at what you’ll need and some helpful tips for each:

• Oreo Cookies: The star of our show! You can opt for regular Oreos or Double Stuf if you prefer extra creaminess. For this recipe, you’ll need them both for baking into the brownies and for topping the frosting. Their distinct chocolatey crunch and creamy filling are what define the “cookies and cream” experience.
• Dark Chocolate Brownie Mix: While any favorite brownie mix will work, I highly recommend a dark chocolate variety like Duncan Hines. The deep, intense flavor of dark chocolate perfectly complements the distinctive black cocoa notes in the Oreo cookies, creating a richer, more cohesive chocolate profile. Ensure you pick a family-size box designed for a 9×13-inch pan.
• Egg(s), Water, and Oil: These are the standard liquid and binding ingredients typically listed on your brownie mix box. Always follow the specific amounts and types of eggs, water, and oil recommended by the manufacturer of your chosen brownie mix for the best results in terms of texture and moisture.
• Shortening: This key ingredient helps achieve that beautifully pristine white marshmallow frosting, mirroring the classic Oreo filling. If you have dietary preferences or simply prefer not to use shortening, refined coconut oil (which has no coconut flavor) is an excellent substitute. Alternatively, you can use additional butter, but be aware that your frosting will have a more ivory or off-white hue. If the color is a concern, choose a lighter-colored butter brand like Land O’Lakes.
• Unsalted Butter: Essential for adding depth of flavor and a creamy richness to your marshmallow frosting. Using unsalted butter allows you to control the overall salt content in your dessert.
• Marshmallow Creme (or Fluff): This is what gives the frosting its signature light, airy, and unmistakably sweet marshmallow taste, reminiscent of the creamy center of an Oreo. It’s a non-negotiable for this particular frosting.
• Powdered Sugar: Crucial for thickening the marshmallow frosting to a spreadable consistency and providing its necessary sweetness. Ensure it’s sifted to avoid any lumps in your smooth frosting.
• Vanilla Extract: A splash of vanilla enhances all the other sweet flavors in the frosting. For a truly white frosting, clear vanilla extract is preferred, but regular vanilla will work fine, imparting a very slight off-white tint.
• Semi-Sweet Chocolate Chips: The foundation of our quick fudge topping. Opt for high-quality chocolate chips for the best flavor and a smooth, glossy melt. Semi-sweet provides a balanced chocolate flavor that isn’t overly bitter or sweet when combined with the other elements.
• Light Corn Syrup: This ingredient is vital for the fudge topping’s texture. It ensures the fudge remains smooth, glossy, and soft-set even after cooling, preventing it from hardening completely and cracking when you cut the brownies.

Crafting the Perfect Oreo Brownie Base

The foundation of our Cookies and Cream masterpiece is a rich, fudgy brownie packed with Oreo goodness. Here’s how to make it perfectly:

• Prepare Your Pan: Begin by preheating your oven to 350 degrees Fahrenheit (175°C). For easy removal and clean cuts, lightly grease a 13×9-inch baking pan with cooking spray. For even simpler lifting, line the pan with parchment paper, leaving a two-inch overhang on the longer sides. This acts as a convenient sling to pull the cooled brownies out of the pan.

• Mix the Brownie Batter: In a large mixing bowl, combine the boxed brownie mix with the specified amounts of egg(s), water, and oil. Use a sturdy whisk or an electric mixer to thoroughly combine the ingredients until the batter is smooth and well-incorporated. Be careful not to overmix; just combine until no dry streaks remain.
• Add the Oreos: Arrange 15 regular Oreo cookies in a single layer at the bottom of your prepared 9×13-inch pan. These cookies will soften beautifully during baking, becoming delightful pockets of cookies and cream within the brownie.
• Pour and Spread: Carefully pour the brownie batter over and around the Oreos, making sure to evenly cover them and fill the pan. Use a silicone spatula to gently spread the batter to the edges, ensuring a uniform thickness.
  (Chef’s Note: You could also try spreading the batter first and then placing the Oreos on top, but there’s a slight chance the batter might not fully envelop the cookies, potentially leaving some exposed. Either way, they’ll be delicious!)

• Bake to Perfection: Bake the brownies in the preheated oven at 350°F (175°C) for 20-23 minutes. To check for doneness, insert a toothpick into the center of the brownies; it should come out with moist crumbs, but not wet batter. Avoid overbaking, as this can lead to dry brownies.
• Cool Completely: Once baked, remove the brownies from the oven and place the pan on a wire rack to cool completely. This step is crucial! Attempting to frost warm brownies will result in melted frosting and a messy dessert. Patience here ensures perfection.

Whipping Up the Dreamy Marshmallow Frosting

While your brownies are cooling down, it’s the perfect time to prepare the star topping: our incredibly light and sweet marshmallow frosting.

1. Cream the Fats: In a large mixing bowl, combine the shortening and unsalted butter. Using an electric hand mixer, beat these two ingredients together until they are light, fluffy, and well combined, typically for 2-3 minutes. This creates the creamy base for your frosting.
2. Add Marshmallow and Vanilla: Scrape down the sides of the bowl, then add the marshmallow creme (or fluff) and vanilla extract. Continue mixing on medium speed until these ingredients are fully incorporated and the mixture is smooth and fragrant.
3. Incorporate Powdered Sugar: Gradually add the powdered sugar, one cup at a time, mixing on low speed to avoid a sugar cloud. Once partially combined, increase the speed to medium and beat until the sugar is fully incorporated.
4. Achieve Smoothness: Continue beating the frosting for another 2-3 minutes on medium-high speed. The goal is a perfectly smooth, light, and airy frosting that holds its shape. If the frosting seems too thick, you can add a tiny splash of milk (about half a teaspoon at a time) until it reaches your desired consistency. Set this delectable frosting aside until your brownies are completely cool.

Whipping Up the Glossy Fudge Topping

With your brownies cooled and frosting ready, the final delicious component is the quick and easy fudge sauce. This adds a beautiful sheen and another layer of chocolatey goodness.

• Combine and Heat: In a microwave-safe bowl, combine the semi-sweet chocolate chips, unsalted butter, and light corn syrup. Place the bowl in the microwave and heat for 30 seconds.
• Stir to Perfection: Remove from the microwave and stir the mixture vigorously with a spoon or whisk until it’s completely smooth and glossy. The residual heat will continue to melt the chocolate. If it appears too thick for drizzling, you can add a teaspoon or two of hot water, stirring well after each addition, until you reach your desired drizzling consistency. (I found that I didn’t need the extra water, but it’s a handy option to have!)

Assembling Your Masterpiece: The Cookies and Cream Brownies

Now for the most exciting part – bringing all the delectable components together to create your ultimate Oreo brownies!

1. Frost the Brownies: Once the brownies are completely cool (this is non-negotiable for a neat finish!), use an offset spatula or the back of a spoon to spread the marshmallow frosting evenly over the entire surface. Aim for a smooth, thick layer that covers edge to edge.
2. Add More Oreos: Take your chopped or quartered Oreo cookies and generously sprinkle them over the marshmallow frosting. You can make the pieces as large or small as you like, depending on your preferred crunch factor. These extra Oreos add visual appeal and a delightful texture contrast.
3. Drizzle the Fudge: Finally, take your prepared fudge topping and artfully drizzle it over the frosted and cookie-topped brownies. You can use a spoon for a rustic look or transfer the fudge to a piping bag (or a Ziploc bag with a corner snipped) for more controlled lines.
4. Set and Serve: Allow the assembled brownies to sit at room temperature for about 15-20 minutes, or until the fudge sauce has cooled down and set slightly. It will remain somewhat soft and gooey, which is perfect for cutting. Once set, cut the brownies into squares and serve immediately.

Expert Tips for Serving and Storing Your Brownies

Once your Cookies and Cream Brownies are assembled, it’s time to enjoy them! Here’s how to get the most out of your delicious creation:

• Cutting and Serving: For neat slices, use a sharp knife and wipe the blade clean between each cut, especially after cutting through the fudge layer. If you used parchment paper to line your pan, simply lift the entire slab of brownies out using the overhanging paper, place it on a cutting board, and then slice. This makes serving incredibly easy and mess-free. Cut into 15 generous pieces for a standard 9×13-inch pan.
• Serving Suggestions: These brownies are absolutely divine on their own, but if you want to elevate the experience, consider serving them warm with a scoop of vanilla bean ice cream. A tall glass of cold milk or a hot cup of coffee also makes for a perfect pairing.
• Leftovers and Storage: To keep any remaining brownies fresh, tightly cover the pan with plastic wrap or aluminum foil. Alternatively, transfer the cut brownies to an airtight container. Store them at room temperature for up to 3-4 days. For longer storage, you can freeze individual brownies wrapped tightly in plastic wrap and then placed in a freezer-safe bag for up to 2-3 months. Thaw at room temperature before enjoying.
• Reheating (Optional): If you prefer a warm brownie experience, individual slices can be gently reheated in the microwave for 10-15 seconds. Be careful not to overheat, or the frosting might melt too much.

Substitutions and Variations to Customize Your Brownies

While this recipe is perfect as is, you can easily tweak it to suit your preferences or dietary needs. Here are some popular substitutions and creative variations:

• For a Different Frosting Style: If you’re aiming for a taste reminiscent of Little Debbie’s Cookies and Cream Brownies, consider using the cream cheese frosting from our Cookies and Cream Cupcakes recipe. It offers a tangy counterpoint that some prefer.
• Homemade Brownie Base: If you prefer to bake from scratch, you can easily substitute the boxed mix with your favorite homemade brownie recipe. Our fudgy brownies recipe would be an excellent choice, promising a dense, rich chocolate foundation.
• Shortening Alternatives: If you’d rather avoid shortening in the frosting, you have a couple of excellent options:
  • Refined Coconut Oil: Use an equal amount of refined coconut oil. Refined coconut oil has a neutral flavor, so it won’t impart any coconut taste to your frosting, and it will help maintain a bright white color.
  • Additional Butter: You can substitute the shortening with additional unsalted butter. Keep in mind that this will result in an ivory or off-white frosting color, as butter naturally has a yellow tint. If color is important, choose a very light-colored butter.
• Different Oreo Flavors: Don’t limit yourself to classic Oreos! Experiment with Golden Oreos for a vanilla-based cookies and cream flavor, Mint Oreos for a refreshing twist, or even seasonal Oreo flavors to match holidays.
• Add-ins to Brownie Batter: Before baking, consider stirring in a handful of chocolate chips, white chocolate chips, or even chopped nuts into the brownie batter for extra texture and flavor.
• Other Toppings: Instead of just chopped Oreos, you could add sprinkles, mini chocolate chips, or a drizzle of caramel sauce alongside the fudge for an even more elaborate presentation.

These Cookies and Cream Brownies truly should come with a disclaimer: proceed with extreme caution, as they are dangerously delicious and incredibly addictive! It’s remarkably easy to find yourself devouring the entire pan, and while I wouldn’t recommend that, I completely understand the temptation. The blend of fudgy chocolate, soft Oreos, fluffy marshmallow, and rich fudge creates an unparalleled dessert experience. I speak from experience when I say that even just looking at the pictures instantly reignites the craving. Enjoy every single glorious bite, and perhaps share a few pieces with appreciative neighbors – it’s a good strategy for self-control!

If you make this recipe, please take a moment to rate and review it in the comments below. Your feedback is greatly appreciated! THANKS!

*Originally published as Oreo Fudge Brownie Pizza on 10/9/2014. Post updated August 2024.