Preheat the oven to 350 F. In a large bowl, mix together cake mix, eggs, and vegetable oil until smooth. Add in food coloring and mix until it is fully pink. Fold in the chocolate chips.
Evenly press the cookie dough into a greased round 9-inch cake pan. Bake for 20-25 minutes. Let cool completely. In a large bowl, mix butter with powdered sugar and vanilla extract until smooth.
Add in the food coloring and mix until it is fully green. Pipe frosting onto the cookie cake.