• Mix baking powder, salt, and flour together in a bowl and set aside.
• In the large bowl of a stand mixer, beat together the butter and sugar until creamy.
• Add egg and vanilla. Beat for a couple more minutes.
• Add the dry ingredients and mix on low just until combined. The cookie dough will be slightly sticky.
• Wrap dough in plastic wrap and refrigerate for 30 minutes. You can divide the dough into two parts and roll them out one at a time if you prefer.
• Preheat the oven to 350F.
• Roll out the cookie dough to a thickness of about 1/4 inch.
• Use cookie cutters to cut out desired shape.
• Place the cookies on a parchment lined cookie sheet. Bake the cookies for about 7-8 minutes. The edges will just starting to color.
• Let the cookies cool on the cookie sheet for a few minutes before transferring to a wire rack to cool completely.

Glaze

• Mix lemon juice and 6-7 tablespoons of powdered sugar together with a whisk. Use more or less powdered sugar based on the consistency you'd like, but the glaze should not be runny.
• Divide the glaze into three bowls. Add a drop of food coloring to each bowl, or leave white.
• Decorate the cookies as desired and let them sit for 30-60 minutes.