"These cheery, blackberry crumb bars are a summertime favorite and make a perfect afternoon snack..."
INGREDIENTS
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For the crust and topping
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3 cups all-purpose flour
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1 cup (2 sticks) cold butter, cut into pieces
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1 cup granulated white sugar
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1/2 teaspoon salt
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1 teaspoon baking powder
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1 large egg
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For the blackberry filling
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4 cups blackberries, halved
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1 tablespoon fresh lemon juice
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1 tablespoon cornstarch
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3/4 cup granulated white sugar