Preheat your oven to 350°F (175°C) and line a couple of sheets with parchment. You want hassle-free cookies, not a stuck-on disaster.
Whisk flour, baking powder, and salt in a bowl. This is dry squad, ready to mingle later.
Beat butter and sugar until pale and fluffy. Scrape the bowl, then add the egg and vanilla. Beat until smooth and irresistible.
Gradually add dry ingredients to the wet, mixing on low just until a soft dough forms. If it feels stubborn, splash in a tablespoon of milk.
Divide dough, roll or press into a disk, wrap, and chill for at least 30 minutes. Chilled dough holds its shape like a champ.
Roll to 1/4 inch thickness on a lightly floured surface. Cut shapes with cookies cutters or go rogue with rounds. Re-roll scraps as needed.
Bake 8–10 minutes, or until the edges are just set and lightly golden. Don’t overdo it—soft centers are the dream.
Cool on a rack. If you must decorate, wait until completely cool and then frost or sprinkle with sugar. Enjoy the sweet victory.