These berry crumb bars are a perfect bake for spring and summer, an easy and delicious way to use fresh berries. Raspberries, blueberries, and blackberries are nestled between layers of a buttery, crisp crumb crust for a treat that’s bright, fruity, and satisfying.
When berries are at their peak, these mixed berry crumb bars are one of the best ways to enjoy them. They deliver a balanced sweet-tart filling with a crunchy, buttery crumble on top and bottom — like an easier, handheld summer pie. Serve them at picnics, potlucks, or warm with a scoop of vanilla ice cream.
Why you’ll love this recipe
- Simple ingredients and an easy method make these bars approachable for any baker.
- Buttery crumb layers bake up crisp and golden for a delightful texture contrast.
- The sweet-tart berry filling is bright and full of fruit flavor.
- You can customize the fruit—fresh or frozen berries both work.
- Perfect for picnics, entertaining, or an everyday dessert.
“The house smells incredible and they taste delicious! It came together easily with ingredients we had on hand. These were even better for breakfast the next day. Yum! ⭐⭐⭐⭐⭐” — reader LM
Ingredients you’ll need
- All-purpose flour, butter, egg, baking powder, and salt form the base of the crumb layers.
- Granulated sugar sweetens both crust and filling.
- Lemon — zest brightens the crumb, and juice flavors the filling.
- Mixed berries (raspberries, blackberries, blueberries) make a flavorful filling; see variations below.
- Cornstarch helps thicken the filling so it isn’t too runny.
Mix and match your favorite fruit
The classic mix here is raspberries, blackberries, and blueberries, but you can use almost any fruit. Try single-variety bars with raspberries or blueberries, or swap in strawberries or peaches. Fresh or frozen fruit both work, so you can enjoy these bars year-round.
How to make these berry crumb bars
- Prepare the crumb base and topping. Combine the dry ingredients with lemon zest, then cut in cold butter and mix in the egg until the dough is crumbly. Press half the mixture into a lined 9×13-inch pan to form the crust.
- Make the berry filling. Toss berries with sugar, lemon juice, and cornstarch until coated, then spread evenly over the crust.
- Assemble. Sprinkle the remaining crumb mixture over the berries in an even layer.
- Bake at 375°F (190°C) for 45–50 minutes, until the topping is golden and the filling is bubbling.
- Cool and slice. Let cool completely before slicing, or chill for firmer, cleaner slices. Store in an airtight container.
baking tip: Line your pan with parchment paper overhang
Line any square, rectangular, or loaf pan with parchment, leaving a few inches of overhang on two sides. This prevents sticking and creates a handy sling to lift the bars from the pan for clean slicing. For breads, transfer to a wire rack after a few minutes; for bars and delicate desserts, allow them to cool fully before lifting to avoid breaking.
Recipe tips and FAQs
- Fresh or frozen berries: Use fresh or frozen. If using frozen, keep them frozen when mixing and increase the cornstarch to 1 tablespoon + 1 teaspoon to prevent a runny filling.
- Cooling for slicing: Cool completely to room temperature before slicing so the bars hold together. For the cleanest slices, chill in the refrigerator for an hour.
- Serving warm: If serving warm, rest a few minutes before slicing or scooping. A scoop of vanilla ice cream or whipped cream pairs beautifully.
- Storage: Store at room temperature in an airtight container for up to 2 days, or refrigerate for up to 7 days to keep the bars firmer.
- Freezing: These bars freeze well. Wrap individual bars or freeze the whole pan for 1–2 months; thaw at room temperature.
More crumb bar recipes
- Strawberry Rhubarb Crumb Bars
- Blueberry Pie Bars
- Caramel Apple Cheesecake Bars
- Oatmeal Jam Bars
5 from 7 reviews
Berry Crumb Bars
Servings: 12 bars
Prep Time: 20 mins
Cook Time: 45 mins
Total Time: 1 hr 5 mins
Ingredients
- 3 cups (360 grams) all-purpose flour
- 1 ½ cup (300 grams) granulated sugar , divided
- 1 teaspoon baking powder
- ¼ teaspoon salt
- 1 tablespoon fresh lemon zest (1 lemon)
- 2 tablespoons fresh lemon juice
- 1 cup (227 grams) cold unsalted butter , cubed
- 1 large egg , lightly whisked
- 1 tablespoon cornstarch
- 5 cups (775 grams) fresh berries such as raspberries, blackberries, and blueberries
Equipment
Pastry blender
9×13-inch baking pan
Mixing bowls
Brownie/bar spatula
Instructions
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Preheat the oven to 375°F. Line a 9×13-inch baking pan with parchment paper and set aside.
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In a medium bowl, combine flour, 1 cup of the sugar, baking powder, salt, and lemon zest. Cut in the cold butter and stir in the egg until the mixture is crumbly with pea-sized pieces of butter. Press half the crumb mixture into the prepared pan to form the base.
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In another bowl, mix the remaining sugar, lemon juice, and cornstarch. Gently fold in the berries and spread the mixture evenly over the crust. Sprinkle the remaining crumb mixture on top.
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Bake 45–50 minutes until the top is lightly browned and the filling bubbles.
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Cool completely to room temperature (or chill for firmer slices). Use the parchment overhang to lift the bars from the pan and transfer to a cutting board to slice.
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Store at room temperature for up to 2 days or in the refrigerator for up to 7 days.
Video
Notes
- Frozen berries: If using frozen fruit, do not thaw before mixing and increase cornstarch to 1 tablespoon + 1 teaspoon.
- Other fruit ideas: This recipe works well with many fruits. Chop larger fruits like peaches, strawberries, or apples into 1-inch pieces before using.
Calories: 412kcal, Carbohydrates: 64g, Protein: 4g, Fat: 16g
Cuisine: American
Course: Dessert
Author: Annalise Sandberg
Note: This recipe was originally published September 2009.