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1
Preheat oven to 350 F (175 C) and line muffin tins with paper cupcake liners
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2
In a large bowl sift together flour, baking powder, salt and cocoa powder
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3
With an electric or with a hand mixer, beat the butter till soft (about1-2 minutes).
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4
Add the sugar and beat until light and fluffy (about 2-3 minutes).
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5
Add the egg and beat until incorporated.
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6
Scrape down the sides of the bowl.
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7
Add vanilla extract and beat until combined.
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8
In a measuring cup whisk the buttermilk with the red food coloring.
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9
With the mixer on low speed, alternatively add the flour mixture and buttermilk to the butter mixture, in three additions, beginning and ending with the flour.
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10
In a small cup combine the vinegar and baking soda.
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11
Allow the mixture to fizz and then quickly fold into the cake batter.
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12
Working quickly, divide the batter evenly among the 12 muffin cups and smooth the tops with an offset spatula or the back of a spoon.
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13
Bake in the preheated oven for approximately 18-23 minutes, or until a toothpick inserted in the center of the cupcakes comes out clean.
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14
Cool the cakes in their pans on a wire rack for 10 minutes and then remove from pan.
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15
Let cool completely before frosting, if desired.