01 -
Preheat oven to 350°F. Line baking sheets with parchment paper.
02 -
Whisk together flour, baking powder, and salt in medium bowl.
03 -
Beat butter and 1 1/4 cups sugar with electric mixer until light and fluffy, 2-3 minutes.
04 -
Beat in egg, egg yolk, and vanilla until combined. Slowly mix in flour mixture.
05 -
Scoop 3-tablespoon dough balls, roll in remaining sugar. Place on sheets and flatten slightly.
06 -
Bake 10-12 minutes until set and lightly browned. Cool 5 minutes on sheets before moving to rack.