Got this recipe from good ol' Betty Crocker: http://www.bettycrocker.com/recipes/mint-chocolate-chip-cookies/22bebeda-ea36-441a-9909-ae78409d6da6
17.5 oz. bag Betty Crocker sugar cookie mix
1/2 c. butter, softened
1/2 tsp. mint extract (which is different from peppermint)
8 drops green food coloring
1 c. creme de menthe baking chips
3/4 c. semi-sweet chocolate chips
Preheat oven to 350 F. In a large bowl, mix together cookie mix, butter, extract, food coloring, and egg. Beat until soft dough forms. Stir in the chips.
Drop by teaspoonfuls 2 inches apart on an ungreased cookie sheet.
Bake 8-10 minutes. Let cool then remove to a wire rack.