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Preheat oven to 350F.
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Line a cupcake pan with liners.
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On medium-high seed, cream the butter and sugar for about 3 mins, until light and fluffy.
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Add the egg and turn the mixture to high.
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Scrape the sides of the bowl and beat until well incorporated.
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In a different small bowl, mix together the cocoa powder, vanilla extract, and red food coloring to make a thick paste.
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(The amount of Red Food Coloring you use is up to you, if you like a bright red use less, if you like a deeper earthy color use 3 tablespoons, but no more.)
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Add to the batter and mix on medium speed until completely combined.
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Scrape the bottom of bowl if necessary to ensure all the batter gets color.
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Reduce the mixer speed to low and slowly add half of the buttermilk.
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Add half of the flour and mix until combined.
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Scrape the bowl and repeat process.
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Beat on high till smooth.
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Reduce the mixer to low and add salt, baking soda, and vinegar.
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Turn to high and beat for no more than 15 seconds just so that everything is completely combined and smooth, but don't over mix!
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Divide the batter evenly into cupcake liners and bake for about 20 mins, or until a toothpick is inserted into the center of the largest cupcake comes out clean.
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Cool for 10 minutes and then remove cupcakes from pan and place them on cooling rack to cool completely for about an hour before frosting.
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For the frosting: Take the room temperature butter and cool cream cheese and mix them on medium-high speed for about 2 minutes.
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Add vanilla extract and continue to beat till well combined.
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Scrape the bowl when necessary.
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Reduce the speed to low and add the powdered sugar in 4 additions, so as not to have it fly everywhere.
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Beat until frosting is smooth yet not overly beaten and runny.
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This makes plenty of frosting to pipe both into the cupcake to give it a filing as well as on top.
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So since there will no doubt be left over frosting, you can freeze it in an airtight container and save it for another use.
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Or if you would like you could just halve the frosting recipe to make less.
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Can be stored in fridge for up to 3 days.
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However, it would be best to let them sit out for about 20 minutes so that they taste moist and fluffy, yet still slightly chilled.