"Blackberry Crumb Bars are an easy, sweet summer breakfast. Bakery-style layer bars with a buttery crumb topping and crust with a fresh blackberry filling...."
INGREDIENTS
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1 1/2 cups flour
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1/4 cup sugar
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1/4 cup brown sugar (, packed)
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1/2 teaspoon baking powder
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1/8 teaspoon salt
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1/2 cup unsalted butter
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1 large egg yolk
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2 cups fresh blackberries
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1 tablespoon lemon juice
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1/4 cup white sugar
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1 tablespoons cornstarch