1-First Step: Prepare the Dough. Combine 2 ½ cups all-purpose flour, 1 tsp baking powder, and ½ tsp salt in a bowl. Whisk well. In a mixer, cream 1 cup softened unsalted butter and 1 cup granulated sugar for 2-3 minutes until fluffy. Beat in 1 large egg and 2 tsp vanilla extract until smooth. Gradually add dry mix to wet, stirring until dough forms. Avoid overmixing for tender results. Divide dough in half, flatten into disks, wrap in plastic, and chill 1-2 hours. This step ensures clean cuts for tree cookies.

2-Second Step: Preheat and Roll Out. Preheat oven to 350°F. Line sheets with parchment. Roll chilled dough on lightly floured surface to ¼-inch thick. Work quickly to keep dough cold. Dust rolling pin if sticky. For uniform Christmas tree shaped sugar cookies, roll between parchment sheets. Chill cutters in freezer for sharp edges. This prevents sticking and distortion.

3-Third Step: Cut and Arrange Shapes. Press 3-4 inch tree-shaped cutter into dough. Dip cutter in flour between presses. Place cookies 2 inches apart on sheets. Re-roll scraps once for best texture; extra rolling toughens. Chill cut cookies on sheet 15 minutes. This stops spreading during bake, key for defined branches.

4-Fourth Step: Bake to Perfection. Bake 8-10 minutes until edges turn lightly golden. Rotate sheets halfway for even heat. Cool on sheet 5 minutes, then transfer to rack. Cookies firm as they cool. Test one sheet first to adjust time. Yields crisp holiday tree sugar cookies ready for icing.

5-Fifth Step: Make Royal Icing. Whip 2 cups powdered sugar, 2 tbsp meringue powder, and ¼ cup water to stiff peaks. Divide into bowls: green for trees, brown for trunks, yellow for stars, colors for ornaments. Thin with water drops for flooding. Use #2 tip for outlines, #3 for fill. Vegan adapt: aquafaba replaces meringue powder.

6-Sixth Step: Decorate Festively. Cool cookies fully. Pipe green base line, build branches upward. Add brown trunk, yellow star. Dot red/gold balls for lights, sprinkle glitter. Dry 1-2 hours per layer. Kids add coconut snow or candy. Gluten-free? Same icing works. Store airtight.

7-Final Step: Serve and Enjoy. Arrange on platters. Pairs with milk or tea. Gift in tins. These best holiday tree sugar cookies shine at parties. Total time pays off in smiles.