Preheat the oven to 350 F. In a large bowl, mix together butter with sugar until smooth. Add in the mint extract. Add in the flour, mix until it is fully combined.
Add in food coloring until it is fully green. Roll the cookie dough into balls and place onto a large ungreased baking sheet at least 2-inches apart. Bake for 10-12 minutes.
Place powdered sugar into a shallow dish. Roll the cookies into the sugar.