INGREDIENTS
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1/2 cup (1 stick) unsalted butter, melted, divided
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2 10-ounce bags frozen sweet cherries or blueberries (no need to thaw)
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2 tablespoons plus 1 cup sugar; plus more for serving
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2 teaspoons finely grated lemon, lime, or orange zest, plus 2 tablespoons fresh juice
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2 cups all-purpose flour
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2 teaspoons baking powder
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1/2 teaspoon kosher salt
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1/4 teaspoon baking soda
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3 large eggs, room temperature, beaten to blend
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2 cups sour cream or whole plain yogurt, room temperature, divided
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A 9-inch round cake pan with 2-inch sides or an 8x8-inch square baking pan