Preheat oven to 350°F. Line standard muffin pan with paper liners; set aside.

Using a countertop mixer, cream together butter and sugar on medium speed until light and fluffy (~3-4 minutes on medium speed).

Add egg and egg yolk; mix until just combined.

In a separate bowl, sift together dry ingredients (flour, baking soda, salt, and cocoa powder). In another bowl, whisk together the liquid ingredients (buttermilk, food coloring, vinegar, and vanilla).

Add ½ of the dry ingredients to the mixing bowl; mix on low speed until fully combined. Add ½ of the liquid ingredients; mix on low until fully combined. Repeat with remaining dry and liquid ingredients. Once all ingredients have been added, scrape the sides of the bowl down with a spatula and mix on medium speed until batter is smooth.

Divide the batter evenly among cupcake liners. Bake at 350°F for 20-22 minutes, or until a toothpick inserted into the center of a cupcake comes out mostly clean.

Let cupcakes cool in pan for 10 minutes before transferring to a cooling rack to cool completely.

Using a countertop mixer, cream together the cream cheese and butter until fully combined.

Add vanilla extract and powdered sugar (½ cup at a time) until frosting reaches desired consistency.

Beat on medium-high speed for 2-3 minutes, or until fluffy.

Once cupcakes are completely cool, fill piping bag with frosting and decorate as desired. (Note: I used an Ateco #827 large star tip and Valentine’s Day themed-sprinkles.)