INGREDIENTS
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1 (15.25- ounce) yellow cake mix
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4 eggs
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1 cup sour cream
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1/4 cup water
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1/3 cup vegetable oil
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1/4 cup granulated sugar
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1 teaspoon vanilla
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6 tablespoons butter, room temperature
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1/3 cup cocoa powder
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3 cups powdered sugar
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1 teaspoon vanilla
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1/3 cup evaporated milk