"These super easy Blueberry Crumble Bars have a buttery shortbread-like base, a juicy layer of blueberries with a hint of lemon, and crunchy crumble base...."
INGREDIENTS
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2 cups fresh or frozen blueberries
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2 teaspoons cornstarch
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1 tablespoon lemon zest
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1 tablespoon freshly squeezed lemon juice (, don't use bottle lemon juice - it's too tart)
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1/4 cup granulated sugar
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1 and 1/4 cup all-purpose flour (, spooned & leveled)
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1/2 cup granulated sugar
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1/2 teaspoon baking powder
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10 tablespoons unsalted butter (, cold (1/2 cup plus 2 tablespoons))
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1 large egg yolk
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1 tablespoon packed brown sugar
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1 tablespoon granulated sugar