1In medium bowl, stir cookie mix, butter, egg and flour until dough forms. Divide dough in half; shape each half into a ball and flatten slightly. Wrap dough in plastic wrap; refrigerate 1 hour or until firm.
2Heat oven to 375°F. On lightly floured surface, roll 1 portion of dough to 1/4-inch thickness. Cut with 3-inch pumpkin-shaped cookie cutter. On ungreased cookie sheet, place cutouts 2 inches apart. Repeat with remaining dough and reroll scraps.
3Bake 10 to 12 minutes or until edges are set. Cool 2 minutes; remove from cookie sheets to cooling racks. Cool completely.
4For each sandwich cookie, spread 1/3 cup ice cream on bottom of 1 cookie; press craft stick in center of ice cream. Top with second cookie, bottom side down; gently press together. Press candy sprinkles into ice cream on edges. Wrap in plastic wrap; freeze 1 hour. Unwrap; decorate cookies with icing. Freeze until firm, about 2 hours. Rewrap in plastic wrap; store in freezer.