1Heat oven to 375°F. In large bowl, stir cookie mix, flour, butter, egg and lemon peel until dough forms; gather into ball. Divide dough in half; shape into 2 disks. Wrap 1 disk in plastic wrap.
2On floured surface, roll unwrapped disk 1/4 inch thick. Cut with 3 1/2-inch mitten-shaped cookie cutter. On ungreased large cookie sheet, place cutouts 1 inch apart. Repeat with second disk. Reroll scraps and cut out additional cookies.
3Bake 8 to 10 minutes or until edges are light golden brown. Cool 1 minute before removing from cookie sheet to cooling rack; cool completely.
4Color frosting with assorted liquid food colors, as desired. Frost cookies with frosting and decorate with candy sprinkles, as desired or using the photo as a guide.