Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.

Cream together the butter and sugar in a large bowl until light and fluffy.

Add the egg, vanilla extract, and red food coloring, and mix until combined.

In a separate bowl, whisk together the flour, cocoa powder, and baking soda.

Gradually add the dry ingredients to the wet mixture, alternating with the buttermilk, until the dough is smooth.

Scoop dough onto the prepared baking sheet and flatten each cookie slightly with your fingers.

Bake for 9-11 minutes, or until the cookies are set but still soft.

Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.

Once cooled, top each cookie with a swirl of cream cheese frosting.