INGREDIENTS
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For the cake:
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4 tablespoons unsalted butter, softened
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¼ cup + 2 tablespoons sugar
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1 egg yolk
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½ teaspoon vanilla
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½ cup flour
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1 tablespoon + 1 teaspoon unsweetened cocoa powder
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¼ teaspoon baking soda
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⅛ teaspoon salt
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2 tablespoons buttermilk
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¼ cup Dr. Pepper (don't use diet)
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For the frosting:
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1 tablespoon butter
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2 teaspoon cocoa powder
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2 tablespoons Dr. Pepper
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1 cup powdered sugar
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¼ teaspoon vanilla