Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.

Cream the softened butter and granulated sugar in a stand mixer until light and fluffy.

Add the egg and vanilla extract, beating until fully incorporated.

In a medium bowl, whisk together the flour, baking powder, and salt.

Gradually mix the dry ingredients into the butter mixture on low speed until a dough forms.

Scoop 1-tablespoon portions of dough and roll into smooth balls.

Place the sprinkles in a small bowl and roll each dough ball in them to coat thoroughly.

Arrange dough balls on the prepared baking sheets 2 inches apart.

Bake for 10 minutes or until the edges are just beginning to turn golden.

Cool on the baking sheet for 5 minutes before transferring to a wire rack.