"Blueberry Crumb Bars are crazy easy to make and loaded with fresh blueberries. No forks needed, so they're perfect for summer picnics and the 4th of July!..."
INGREDIENTS
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3 cups all-purpose flour
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1 cup granulated sugar
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1 teaspoon baking powder
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¼ teaspoon salt
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1 cup cold unsalted butter, cut into small cubes
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1 egg
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4 cups fresh blueberries ((20 ounces))
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½ cup granulated sugar
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4 teaspoons cornstarch
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Juice of one lemon (about 3 tablespoons)