01 -
Preheat the oven to 375°F. Line two cookie sheets with parchment paper.
02 -
Combine softened unsalted butter, 1/2 cup powdered sugar, and vanilla extract in a mixing bowl. Beat with an electric mixer until light and fluffy.
03 -
Add all-purpose flour and salt to the butter mixture. Mix until a cohesive dough forms. Gently fold in rainbow sprinkles. If the dough is overly soft, chill until manageable by hand.
04 -
Scoop dough into rounded balls using a 1- or 2-tablespoon measure and arrange evenly on prepared baking sheets.
05 -
Bake 7–10 minutes for smaller balls or 10–14 minutes for larger ones, ensuring the cookie bottoms are just lightly golden. Allow cookies to cool on pans for 5 minutes.
06 -
Fill a small bowl with powdered sugar. Roll each warm cookie in sugar to coat thoroughly, then transfer to a wire rack to cool completely. For extra coverage, dust or roll again after cooling.