For this Christmas tree Sugar Cookies I used the cookie tree cutter kit from wiltoncakes

Cut 2 stars of each size, and 3 stars of the smallest size (21 cookies in total). Bake and let cool completely.

Pipe a bit of buttercream in the middle of your cake stand and place one of the 2 largest stars; add some buttercream in the middle of the star and place the second star of the same size on top, alternating points

Continue to build upward, adding remaining star cookies in the same manner. You will have one small star left, this will be the top star of your Christmas tree