INGREDIENTS
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2 cups frozen blueberries
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1/2 cup sugar
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1 tablespoon cornstarch
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3/4 cup butter, room temperature
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1 1⁄3 cups sugar
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3 large eggs
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1 cup sour cream
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1 teaspoon vanilla
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2 1/4 cups flour
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1/2 teaspoon baking powder
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1/2 teaspoon salt
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1/4 teaspoon baking soda
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2 teaspoons lemon zest
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1 3/4 cups flour
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1⁄3 cup sugar
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1⁄3 cup packed brown sugar
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1 1/2 teaspoons ground cinnamon
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3/4 cup butter, melted
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Confectioners’ sugar (optional)