In a medium bowl, combine flour, salt, and baking soda. Set aside.

In a large bowl, beat butter and sugar until light and fluffy. Add the eggs, and vanilla and beat until combined.

Add the flour to the butter mixture and beat until smooth. Divide the dough in half and wrap each half in plastic wrap. Chill in the refrigerator for an hour.

After the dough has chilled, preheat the oven to 350 F. Line two baking sheets with parchment paper.

Remove half of the chilled dough from the refrigerator. On a lightly floured surface, roll the dough to about ¼ inch thickness.

Use star cutters to cut out 2 of each size of star. Place cookies onto the prepared baking sheets.

Place the baking sheets with the unbaked cookies into the refrigerator for 15 mins. This helps the cookies keep their shape when they are baked.

Bake the cookies for 8-10 minutes or until the edges are just starting to brown. Let them cool on the baking sheet for 2-3 minutes before transferring them to a wire rack to cool completely.

In a medium bowl, beat butter until smooth. Beat in vanilla extract.

On low speed, gradually beat in powdered sugar, scraping the sides of the bowl as needed.

Add the milk and beat until combined.

Turn to high speed and beat frosting until fluffy, about 5 minutes.

Save a small amount of white frosting. Add a few drops of green food coloring to the rest of the frosting and beat until combined.

Transfer the green frosting to a piping bag fitted with a star tip.

Pipe a mixture of stars, swirls, and hidden Mickeys onto each star cookie. Save some frosting to secure cookies during assembly. The centers of the cookies will be covered, so you don’t need to decorate them completely.

Spread a thin layer of white frosting onto the smallest star cookie. Cover it with yellow sanding sugar. Gently shake off excess sugar and set aside.

Add desired sprinkles to the green star cookies and let rest uncovered for a couple hours until the frosting has set.

Place the largest star cookie on a flat plate or cake stand. Stack the star cookies on top of it, from largest to smallest, twisting them so that they’re offset from each other. Place a small bit of frosting in the center of each cookie to secure them.

Place the small star with yellow sanding sugar on the top of the cookie tree, standing up. Use a bit of frosting to secure, if needed.