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Preheat oven to 350.
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Heat milk in small pan until bubbles form around the edges. Remove from heat.
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Mix cocoa and white sugar together in a bowl. Slowly beat in warm milk. Let cool.
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Cream the butter with the brown sugar. Beat in the eggs, sour cream and vanilla. Add cocoa mixture.
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Mix remaining dry ingredients together and blend in to butter mixture. Don't overbeat.
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Turn in to two well-greased and floured 9 inch layer cake pans and bake 25-30 minutes, until cake shrinks slightly from sides of pans, and springs back when touched gently in the center.
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Cool on a rack for a few minutes, then turn out of pans on to rack.
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Wait until completely cool before frosting.
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See "7 Minute Frosting" for Easy Frosting Recipe.