1Heat oven to 375°F. In medium bowl, stir cookie mix, flour, softened butter and egg until soft dough forms. Roll dough on floured surface to about 1/4 inch thick. Cut with cookie cutters. Place 1 inch apart on ungreased cookie sheet.
2Bake 7 to 9 minutes or until light golden brown around edges. Cool 1 minute before removing from cookie sheet; cool completely.
3Spread frosting on cooled cookies. Decorate as desired with remaining ingredients.