In a medium mixing bowl, whisk together the flour, baking soda, salt.
In a large mixing bowl or the bowl of a stand mixer, cream the butters, sugar, and brown sugar on medium speed until light and fluffy, about 2 minutes. Scrape the sides of the bowl and add the vanilla and egg, beating on low until incorporated.
Add in the dry ingredients and beat until just combined.
Scoop out dough using a large cookie scoop and roll each dough ball in the sprinkles until completely covered. Chill for at least 2 hours.
Preheat the oven to 350 degrees and prepare cookie sheets by lining them with silicone baking mats or parchment paper.
Place cookie dough on the prepared baking sheets 2 inches apart and bake for 15-18 minutes or until tops of the cookies have just begun to crack and are just beginning to brown around the edges. Allow to cool on the sheet pans for about 5 minutes before removing to a cooling rack to complete cooling.