Christmas Tree Cookie Stack in 90 Minutes

Instructions:

1. Cream the softened butter and granulated sugar together until the mixture is pale and fluffy.
2. Beat in the eggs one at a time, followed by the vanilla extract.
3. Sift in the flour, baking powder, salt, and cornstarch. Mix on low until a soft dough forms.
4. Wrap the dough in plastic wrap and chill in the refrigerator for at least 60 minutes.
5. Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.
6. Roll the chilled dough to 1/4 inch (6mm) thickness.
7. Cut out an equal number of stars using different-sized cutters (e.g., 4 large, 4 medium, 4 small).
8. Bake for 8-10 minutes, or until the edges are barely golden, then transfer to a wire rack to cool completely.
9. Mix powdered sugar, cream, vanilla, and green coloring until the icing is thick and holds a peak.
10. Stack the cookies from largest to smallest, applying a dollop of royal icing between layers and rotating each layer 45 degrees.
11. Top with a yellow star candy and decorate with nonpareil sprinkles.