1Heat oven to 350°. Grease 12-inch pizza pan. Stir powdered sugar, margarine, vanilla and egg in medium bowl until well blended. Stir in baking mix until soft dough forms. Pat dough in pan. Bake 12 to 14 minutes or until light golden. Cool completely.
2Stir food color into frosting; spread over cookie. Sprinkle crushed chocolate cookies on half of frosted cookie.
3Use pretzels to form fence and tree; add candy corn for leaves. Arrange cookie halves in frosting for tombstones. Flatten gumdrops; cut to form bat, moon and ghost and place on cookie. Add pumpkins and gummy worms.