Prepare Roll-Out Cookie recipe following recipe instructions, adding peppermint candy flavor.* Roll out dough 1/8 in. thick; cut tree shapes and arrange on cookie sheet. Bake 7-8 minutes or until cookies are lightly browned. Cool on cookie sheet 1 minute; remove to cooling grid and cool completely.
Prepare icings. Tint portions of each icing green, reserving some white.
With royal icing, with tip 3,
outline tree with green;
flow in with thinned icing. Let dry. For trees with stars, fill in star with white icing; add yellow colored sugars and let dry. Add white icing garland using tip 3 outline, swirl or zigzag; arrange candy cane sprinkles.
With green buttercream icing, spatula ice cookies smooth or cover cookies with tip 3 zigzag "tree boughs." For trees with stars, ice star with white icing; add yellow sugars, pressing lightly into the icing. If desired, add white icing garlands to trees. Arrange candy cane sprinkles and jumbo nonpareils.
* Variation: tint cookie dough green with Leaf Green Icing Color. Cut cookies as above. Decorate as desired with white icing, sprinkles and sugars.