Preheat the oven to 350°.
Either using a stand mixer or a handmixer, cream together the butter and sugar. Cream for about two minutes or until light and fluffy.
Scrape down the sides of the bowl. Add in the eggs and vanilla and mix until well combined.
Add in the flour, baking powder, and salt. Mix until fully incorporated. The dough will be very sticky.
Pour your sprinkles into a bowl. Scoop the cookie dough out of the mixing bowl and place in the sprinkles.
Roll the dough around in the sprinkles until it is fully covered. Reshaped the dough into a ball before placing on a parchment paper lined cookie sheet.
The cookies will spread quite a bit while baking, so I suggest limiting each cookie sheet to about eight cookies.
Bake at 350° for 10 minutes. Cool completely on the pan.
The cookies will stay fresh in an airtight container for 2 to 3 days.