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

In a bowl, cream butter, granulated sugar, and powdered sugar until light and fluffy.

Mix in the egg and vanilla extract until combined.

Gradually add flour, baking powder, and salt, mixing until a soft dough forms.

Roll dough into 1-inch balls, then coat with sprinkles or colored sugar.

Place on the baking sheet, spacing them 2 inches apart.

Bake for 8-10 minutes, or until edges are lightly golden.

Let cool on a wire rack and enjoy!