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To prepare batter, place butter in a large bowl; beat with a mixer at medium speed until fluffy. Add sugar and 1 tsp vanilla; beat until well-blended (about 5 minutes). Add egg whites and egg, one at a time, beating well after each addition. Add cocoa and fat-free milk; beat well (mixture will apppear curdled). Combine flour, baking powder, and salt in a small bowl; stir with a whisk. Add to cocoa mixture; beat at low speed just until blended. Spoon batter into prepared pan.
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