1Heat oven to 375°F. In medium bowl, stir cookie mix, butter, flour and egg until dough forms. Sprinkle candy sprinkles over dough; gently kneed into dough.
2Roll dough on floured surface until about 1/4 inch thick. Cut with cookie cutters. Place 1 inch apart on ungreased cookie sheet.
3Bake 7 to 9 minutes or light golden brown around edges. Cool 1 minute before removing from cookie sheet; cool completely, about 20 minutes.
4Decorate with frosting and additional candy sprinkles as desired.