Whisk together the flour, baking powder, and salt. Set aside.
Using an electric mixer on medium speed, beat the butter and granulated sugar until light and fluffy. Add the eggs, one at a time, mixing well after each addition. Mix in the vanilla.
Reduce mixer speed to low. Gradually add the flour mixture, mixing just until combined. Stir in the sprinkles.
Refrigerate the dough for 30 minutes.
Preheat oven to 350°F (175°C). Line baking sheets with silicone liners or parchment paper. Place the confectioners’ sugar in a small bowl.
Using a tablespoonful of dough at a time (I use a #50 scoop), roll the chilled cookie dough into balls. Then roll each in confectioners’ sugar, making sure to coat thoroughly.
Place the cookies on the prepared pans, leaving about 2 inches between the cookies. Bake, one pan at a time, 14 to 18 minutes, or until the edges are lightly browned. Do not over-bake.
Cool the cookies on the pan for 5 minutes. Then transfer them to a wire rack to cool completely.
Notes
Store cookies in an airtight container at room temperature up to a week.