3)Beat sugar and butter in large bowl with electric mixer at medium speed for 4 minutes or until light and fluffy. Add eggs, one at a time, beating well after each addition. Add coca mix; beat until well blended and uniform in color. Alternately add flour mix and buttermilk mix, beating well after each addition. Stir vinegar into baking soda in small bowl; gently stir into batter with spatula or spoon (do not use mixer). Spoon evenly into prepared muffin cups.
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