Ultimate Grasshopper Cookies Ingredients Cookies: 1 Box Devil's Food Cake mix 2 eggs 1/2 C. butter, melted 1 tsp. vanilla extract 3 Tbsp. brown sugar Mint Frosting: 3/4 C. butter, softened 1 1/2 tsp. peppermint extract 2-3 C. powdered sugar milk, if needed green food dye, if desired Chocolate Glaze: 1 1/2 C. chocolate chips