Perfect Blackberry Crumble Bars (Print Version)

Buttery bars with juicy blackberries and golden crumb topping

# What You Need:

→ For the Crust & Crumble

01 - 2 cups all-purpose flour
02 - 1 cup granulated sugar
03 - 1/2 teaspoon baking powder
04 - 1/4 teaspoon salt
05 - 1/2 teaspoon ground cinnamon
06 - 1 cup unsalted butter, cold and cubed
07 - 1 large egg

→ For the Blackberry Filling

08 - 3 cups fresh blackberries (or frozen, thawed and drained)
09 - 1/2 cup granulated sugar
10 - 2 tablespoons cornstarch
11 - 1 tablespoon fresh lemon juice
12 - 1 teaspoon lemon zest

# Directions:

01 - Preheat oven to 350°F. Line a 9x9-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a large bowl, whisk together flour, sugar, baking powder, salt, and cinnamon until well combined.
03 - Add cold, cubed butter and blend with a pastry cutter or your fingers until mixture resembles coarse crumbs.
04 - Add the egg and mix until dough starts to come together. The mixture will appear crumbly, which is expected.
05 - Press about two-thirds of the dough firmly into the bottom of the prepared pan to form an even crust layer.
06 - In another bowl, gently toss blackberries with sugar, cornstarch, lemon juice, and lemon zest until evenly coated.
07 - Spread the blackberry mixture evenly over the crust, ensuring an even distribution of berries.
08 - Crumble the remaining dough evenly over the blackberry layer, covering the filling completely.
09 - Bake for 38–42 minutes until the top is golden brown and the filling is bubbling at the edges.
10 - Cool completely in the pan on a wire rack before lifting out and slicing into 16 bars.

# Expert Tips:

01 -
  • The buttery crust doubles as the crumble topping, so you make one simple mixture and youre halfway done
  • Fresh blackberries turn jammy and sweet in the oven, creating pockets of fruit that burst when you bite into them
  • These bars travel beautifully and actually taste better on the second day, making them perfect for potlucks and picnics
02 -
  • These bars need to cool completely before you slice them, or the filling will be too loose and the crust might crumble apart
  • If using frozen blackberries, thaw and drain them well, or your bars will end up with a soggy bottom layer
  • The dough should feel crumbly when you press it into the pan, not smooth like cookie dough, or you will lose the crumbly texture
03 -
  • If your blackberries are very tart, taste one before mixing and add an extra tablespoon of sugar to the filling
  • Room temperature egg incorporates more easily into the crumbly dough, so let it sit out while you gather ingredients
  • Chill the bars for 30 minutes after baking but before slicing for the cleanest cuts

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