Preheat the oven to 350 degrees Fahrenheit.
In a medium sized mixing bowl, combine the flour and baking powder. Use the scoop & level method to measure the flour. Set this bowl aside.
In a stand mixer with the paddle attachment, cream the butter and sugar together.
Mix in the egg and vanilla extract until just combined.
Slowly mix in the flour and baking powder mixture. The dough will be dry at first but will eventually form a ball.
Add in the sprinkles and stir on low until just combined.
Roll the dough out on a floured surface or a piece of parchment paper to 3/8" of an inch thick.
Cut out the cookies and place on a lined baking sheet. Make sure to not overcrowd the pan. I like to place only six cookies on a baking sheet at a time.
Bake the cookies for 9-11 minutes or until the tops of the cookies no longer appear wet.
Allow the cookies to cool on the baking sheet for a few minutes before moving them onto a cooling rack. Continue baking the rest of the cookies until the dough is gone.