1. Prepare the Crust:

1. Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.
2. In a large bowl, cream together butter and sugar until light and fluffy.
3. Add eggs one at a time, then mix in vanilla extract.
4. In a separate bowl, whisk together flour, baking powder, and salt. Gradually add to the wet ingredients.
5. Fold in colored sprinkles until evenly distributed.
6. Roll dough into 1-inch balls and place on prepared baking sheets. Flatten slightly with your palm.
7. Bake for 10-12 minutes or until edges are lightly golden. Let cool completely.
8. For the glaze, whisk powdered sugar and milk until smooth. Drizzle over cooled cookies and add extra sprinkles if desired.