"If you like lemon, you'll love this! This cake is wonderfully light with lots of flavor...."
INGREDIENTS
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1 3/4 cups all-purpose flour
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3/4 teaspoon baking powder
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3/4 teaspoon baking soda
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1 1/4 cups sugar
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1/2 cup unsalted butter, softened
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1/4 cup vegetable oil
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2 teaspoons grated fresh lemon zest
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4 large eggs
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1 large egg yolk
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2 teaspoons vanilla extract
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1 cup sour cream
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2 1/4 cups powdered sugar
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1/2 cup fresh lemon juice