Raspberry Crumble Bars feature sweetened fresh or frozen raspberries sandwiched between a brown sugar oat crust and a crumbly topping. These chewy, fruit-forward bars have the texture of an oatmeal cookie with a jammy center—perfect for snack time or dessert.
If you enjoy streusel or fruit crisps, these bars will be a favorite. They combine the buttery shortbread-like base of crumb bars with a bright, tart raspberry filling.
Think of Raspberry Crumble Bars as a chewy granola or oatmeal cookie with a thick raspberry filling—easy to slice and serve.
These bars were inspired by classic fruit crisps and streusel desserts. The combination of fruit and crumb topping is a reliable crowd-pleaser, and adapting that idea into portable bars makes them ideal for parties, picnics, or lunchboxes.
I’ve adapted this crumble-bar method for many fruits on my blog, always using a similar buttery, oat-rich crust and crumb topping that works beautifully as both base and topping.
- Blueberry Crumb Bars
- Peach Crumb Bars
- Lemon Crumb Bars
- Strawberries & Cream Crumb Bars
- Apple Crumb Bars
- Cherry Chocolate Chip Crumb Bars
Each variation uses the same shortbread-like crust and streusel topping—just swap the fruit to change the flavor.
Raspberry Crumble Bars
These bars use a streusel-style mixture of flour, oats, butter, and brown sugar that serves as both the crust and the crumb topping. The result is a sturdy, buttery base with a crisp, golden top and a thick, fruity center.
There’s a related Lemon Raspberry Crumb Bars recipe that replaces the simple fruit filling with a creamy lemon-raspberry layer for a brighter, slightly tangy variation.
Fresh or Frozen Raspberries?
The filling works equally well with fresh or frozen raspberries. Fresh raspberries are wonderful but require a larger quantity (4–5 cups) and can be more expensive. Frozen berries are more economical, available year-round, and bake up nicely if prepared correctly.
When using frozen raspberries, thaw and gently rinse them in a fine mesh strainer or colander over a bowl until the water runs mostly clear. Allow the excess water to drip off; pressing the berries gently with a spatula helps remove more liquid. Excess moisture can make the filling runny, so take care to remove as much water as possible before combining the berries with sugar, lemon juice, and cornstarch.
Once the fruit mixture is combined, it will release additional juices and should go into the oven promptly so the filling can thicken and set rather than becoming mushy.
Baking and Other Tips:
- When baking, aim for the center to bubble like a pie. That bubbling indicates the filling has reached a sufficient temperature to thicken properly. The crust should turn a nice golden brown to ensure it’s baked through.
- Chilling these bars for at least 1–2 hours before slicing helps the fruit layer set up and makes cleaner slices. They’re still delicious warm, but chilled bars hold together better and are easier to serve.
- Feel free to swap fruits. The crust/topping works for blueberries, peaches, apples, cherries, and more—adjust the sugar to suit the fruit’s natural sweetness.
Raspberry Crumble Bars
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Ingredients
Crust/Topping:
- 1 cup (226 g) butter, (2 sticks) room temperature
- 1 ¼ cup (250 g) brown sugar, gently packed
- 1 ¼ cup (100 g) quick oats
- 1 ¾ cup (210 g) all-purpose flour, (stir, spoon, & level)
- ½ tsp salt
- 1 ¼ tsp baking powder
Filling:
- 24 oz (680 g) fresh or frozen raspberries
- ½ – 1 cup (100-200 g) granulated sugar, depending on tartness of the berries
- ¼ cup (40 g) cornstarch
- 1 Tbsp lemon juice
Equipment
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13×9-inch pan
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Parchment paper (optional but helpful)
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Fine mesh strainer or colander
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Mixing bowls
Instructions
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Preheat oven to 350°F (175°C).
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Rinse and drain raspberries in a mesh strainer or colander set over a bowl. If using frozen berries, rinse until mostly thawed and the water runs clearer. Gently press to remove excess liquid.
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In a large bowl, combine the crust/topping ingredients: butter, brown sugar, quick oats, all-purpose flour, salt, and baking powder. Mix until the butter is fully incorporated and the mixture begins to clump.
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Press about two-thirds of the mixture into the bottom of a lightly greased 13×9-inch (9×13) pan. Lining the pan with parchment paper that extends over the sides makes it easy to lift the baked bars out.
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In a separate bowl, toss the drained berries with granulated sugar, cornstarch, and lemon juice. Spread the fruit mixture evenly over the pressed crust, then sprinkle the remaining crumb mixture on top.
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Bake at 350°F for 35–45 minutes, until the crust is golden and the filling bubbles in the center. If the crust browns too quickly, tent the pan with foil while the center finishes bubbling.
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For clean slices, chill the bars 1–2 hours before cutting. They can be served warm like a fruit crisp, but chilling helps the filling set. Store leftovers covered in the refrigerator.
Nutrition
Disclaimer: Nutritional values were calculated using a third-party tool and are provided as an estimation only.
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