01 -
Preheat oven to 300°F and line two baking sheets with parchment paper or silicone baking mats.
02 -
In a large mixing bowl, beat softened butter and powdered sugar using an electric mixer on medium-high speed for at least 5 minutes until pale and very fluffy.
03 -
Add all-purpose flour, 1/4 cup cornstarch, salt, and vanilla extract. Beat on low speed until a soft, cohesive dough forms.
04 -
Dust hands lightly with cornstarch. Portion dough into balls, each approximately 2 teaspoons to 1 tablespoon in size. Arrange evenly on prepared baking sheets, leaving space between each.
05 -
Dip the tines of a fork in cornstarch and gently flatten the top of each dough ball. Add sprinkles to the top if desired.
06 -
Bake for 14 to 16 minutes, or until tops appear just set but with minimal color change. Remove from oven and let cool completely on baking sheets.