Instructions
Whisk the flour, baking powder, and salt together in a medium bowl. Set aside.
Beat the butter and sugar in a large bowl on medium-high speed until creamy, about 1 minute.
Add the egg and vanilla. Beat until combined, scraping down the bowl as needed.
Add the dry ingredients and mix on low just until combined. Mix in the sprinkles.
Scoop about 2 tablespoons of dough per cookie and roll into balls. Add extra sprinkles to the tops if desired.
Cover and chill the dough balls in the refrigerator for at least 2 hours.
Heat the oven to 350°F (177°C). Line baking sheets with parchment paper or silicone baking mats.
Place chilled dough balls about 3 inches apart on the prepared sheets. Bake for 12–13 minutes, until the edges are lightly browned.
Cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.