Preheat oven to 350°F. In bowl, beat butter, 1/4 cup granulated sugar and dark brown sugar until light and fluffy. Beat in egg; beat in food coloring and vanilla.
Whisk together flour, cocoa, baking powder and salt; stir into butter mixture until incorporated. Fold in chopped SNICKERS®
Divide batter into 20 portions; roll into balls. Roll each ball in remaining granulated sugar, then in icing sugar. Place on parchment paper lined–baking sheet, at least 2 inches apart.
Bake for 10 to 12 minutes or until puffed and cracked but still slightly gooey in center. Let cool completely on baking sheet. Tip: Decorate cookies with candy eyes if desired.