Heat oven to 375°F. In medium bowl, stir cookie mix, butter and egg until soft dough forms. Shape dough into 32 (1-inch) balls. Place 1 inch apart on ungreased cookie sheets. Bake 7 to 9 minutes or until edges are light golden brown. Cool 1 minute. Remove from cookie sheet to cooling racks. Cool completely, about 20 minutes. Decorate cookies as desired, using cookie icing and sprinkles. Store in airtight container. Tips: For larger cookies, shape dough into 24 (1 1/4-inch) balls. Bake 8 to 10 minutes or until edges are light golden brown. Design your own Halloween cookie using the black and orange cookie icing to make a pumpkin face or spider web.