Freeze dough 15 minutes.
Roll dough to a 1/4-inch thickness on a floured surface, and cut with a 3-inch Christmas tree-shaped cookie cutter. Place 2 inches apart on ungreased baking sheets.
Bake at 350° according to package directions or until lightly browned. Remove from oven; let cool 1 minute on baking sheets. Remove to wire racks; cool 20 minutes or until completely cool.
Frost tops of cookies with ready-to-spread vanilla frosting, and sprinkle with red and green colored sugars and sprinkles.