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1. Preheat oven to 350 degrees and line pans with cupcake liners.
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2. Sift flour, cornstarch, baking soda, baking powder, cocoa and salt together and whisk to evenly combine. Set aside.
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3. In a stand mixer, beat butter for 2 minutes until smooth. Add sugar and beat again for 1 minute (scrape down sides of the bowl as needed). Add oil and beat again for 2 minutes. Add eggs one at a time mixing at medium-low speed.
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4. Slowly add in the previously mixed dry ingredients and alternate between adding the dry ingredients and the buttermilk. Add vanilla extract, vinegar and as much liquid red dye as desired and stir just until combined.
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5. Fill cupcakes liners 2/3 full and bake for 18-22 minutes or until an inserted knife comes out clean
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6. Let cool.
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7. Cookie Dough Frosting: Beat butter until smooth. Add brown sugar and beat for 2 minutes to let sugar dissolve. Add flour and beat again. Add vanilla extract, sprinkle in salt and add 2 cups of powdered sugar. Taste at this point and decide if you want your frosting to be more sweet like a traditional frosting (by adding more powdered sugar) or more like a cookie dough (by adding more flour).
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8. Pipe onto cooled cupcakes and sprinkle with mini chocolate chips.