INGREDIENTS
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1 1/2 cups all-purpose flour
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1 1/2 tsp baking powder
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1/2 tsp salt
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1/4 cup butter, melted
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2 Tbsp vegetable oil
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1 cup granulated sugar
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1 large egg
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1 tsp vanilla extract
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1 1/2 tsp lemon zest (the zest of about 1 large lemon or 1 1/2 small lemons)
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1/4 cup sour cream
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2/3 cup buttermilk
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1 cup frozen blueberries
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1/2 cup butter, softened
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4 cups powdered sugar
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2 - 3 Tbsp heavy cream
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2 Tbsp fresh lemon juice
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1/2 tsp lemon zest
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Yellow food coloring, optional
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2 Tbsp granulated sugar
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1 tsp cornstarch
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1 1/2 cups fresh or frozen blueberries
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1/4 cup water