01 -
Beat the softened salted butter and powdered sugar with a stand mixer or hand mixer for 5-7 minutes, until very pale, light, and fluffy. Scrape the bowl once or twice.
02 -
Beat in the vanilla extract just until combined.
03 -
Whisk the flour and cornstarch together in a separate bowl. Add to the butter mixture in three additions on low speed, mixing only until the dough comes together.
04 -
Cover the dough and chill for 30-45 minutes, until firm enough to scoop without sticking heavily to your hands.
05 -
Heat the oven to 300 F. Line two baking sheets with parchment. Scoop 1-inch dough balls, place them 2 inches apart, and press gently with a fork dipped in cornstarch.
06 -
Bake for 12-14 minutes, until the tops look dry and the bottoms are only faintly golden. Cool completely on the baking sheet before transferring.