"Summary: The perfect blend of creamy, tart, & sweet with a to-die for crunchy sugar crust!..."
INGREDIENTS
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1 stick unsalted butter, divided and softened (plus more for greasing pan)
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3/4 cup + 1/3 cup sugar, separated
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1 egg
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2 cups + 1/3 cups flour, separated
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2 teaspoons baking powder
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3/4 teaspoon salt
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1/2 cup milk
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3 cups blueberries
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1/3 cup brown sugar
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1/2 teaspoon cinnamon
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1/2 cup sour cream
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1/2 cup powdered sugar
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1/2 teaspoon vanilla
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1/4 teaspoon baking soda