INGREDIENTS
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1 box devil's food cake mix
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3 eggs
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1/2 C. oil or melted butter, cooled
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3/4 C. buttermilk
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1/2 C. sour cream
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2 tsp. vanilla extract
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1 C. butter, softened (not melted)
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1/3 C. brown sugar, packed (make sure there are no rock-hard chunks)
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1 tsp. vanilla extract
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3-4 C. powdered sugar