INGREDIENTS
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1/4 cup + 3 tbs Dutch-processed (alkalized) cocoa (see NOTES for substitution)
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2/3 cup sour cream
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2 eggs
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1 1/2 tsp vanilla
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1 1/2 cups + 1 tbs sifted cake flour
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3/4 tsp baking powder
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1/4 tsp baking soda
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1 cup sugar
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1/2 tsp salt
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14 tbs unsalted butter, softened