Preheat your oven to 350℉.
In a large bowl (or the bowl of a stand mixer), beat together the room temperature butter and sugar until light and fluffy – high speed on the stand mixer, your best effort if by hand.
Add the eggs and vanilla extract to the butter mixture and beat to combine. Be sure to scrape the sides of the bowl to make sure everything is getting incorporated.
Switch to a spatula and mix in the flour, baking soda, kosher salt, and cream of tartar.
When the dry ingredients are 90% of the way combined with the wet, add the sprinkles and continue mixing until everything comes together.
Scoop into cookie dough balls, 3 tablespoon size. Place each ball of dough 2-inches apart on prepared baking sheets (cookie sheet or baking sheet lined with parchment paper).
Bake at 350°F for 12-14 minutes until the edges are just getting golden. Let the baked cookies cool on the baking sheet for 5 or so minutes, then transfer to a wire rack to cool completely.