Combine butter, eggs and cake mix, mixing until well combined.
Add 1/4 cup powdered sugar, peppermint extract, and food coloring. Mix well.
Place remaining 1/4 cup powdered sugar in a shallow dish. Roll dough into tablespoon-sized balls, roll in the powdered sugar to coat, and place on baking sheet. Bake at 350F for 10-12 minutes.
Let cool before serving.
Notes
I used Wilton gel icing coloring, which is difficult to measure. I used the color Kelly Green by Wilton. Recipe from Jen's Favorite Cookies.