In a stand mixer fit with the whisk attachment, beat the butter and sugar together until light and fluffy, about 3 minutes.
Use a rubber spatula to scrape down the sides of the bowl, adding the egg and the vanilla extract. Beat until light and fluffy and pale in color.
Add the flour, baking powder, baking soda, and salt and beat until just combined and no streaks of flour remain. Do not overmix. Add the sprinkles and turn the mixer on quickly to distribute the sprinkles. Try not to mix the dough much or this will cause the sprinkles to break.
Use a 1 ounce cookie scoop to scoop the dough into 1 inch balls, dropping them onto your cookie sheet about 2 inches apart. Bake for 11 minutes or until the cookies are just set on the edges, but still very gooey in the middle. This will keep your cookies super soft. Allow the cookies to cool for 10 minutes before transferring to a cooling rack. Enjoy!
Notes
These funfetti cookies can be stored in a airtight container or plastic bag for up to 3 days at room temperature, in the fridge for up to a week or in the freezer for up to 3 months.