Preheat the oven to 350 F. In a large bowl, combine butter with powdered sugar until fluffy. Add in flour, cocoa powder, and vanilla extract, and mix until combined. Add in the red food coloring, and mix until it is fully red.
Roll the cookie dough into balls, and flatten each one slightly. Place cookies onto a large ungreased baking sheet. Bake for 10-12 minutes.