Step 1: Preheat the oven to 350ºF.
Step 2: Line two 12-cup muffin pans with paper liners. Set aside.
Step 3: In a large bowl, beat together the oil, butter, and sugar for 10 minutes on medium speed, until light and fluffy.
Step 4: Add the eggs, one at a time, mixing for about 20 seconds after each addition. Beat in the vanilla.
Step 5: In a separate bowl, combine the flour, cocoa powder, baking powder, baking soda, and salt. Stir with a whisk.
Step 6: Gradually add the flour mixture to the butter mixture alternating with the buttermilk, begin and end with the flour mixture. Beat until well blended.
Step 7: Add the vinegar and food coloring. Beat until fully incorporated and no streaks remain in the batter.
Step 8: Fill the prepared muffin cups ⅔ full.
Step 9: Bake for 15-18 minutes or until a wooden toothpick inserted into the center comes out with only a few dry crumbs.
Step 10: Cool the cupcakes in the pan for 10 minutes, then transfer to a wire rack to cool completely. Frost as desired.
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