In a medium bowl whisk dry ingredients and set aside. In a stand mixer, beat eggs and sugar until very think and light in color, about 3 minutes. Beat the vanilla. Gradually add the melted butter, then beat in sour cream in two additions. Scrape bottom of bowl and make sure everything is incorporated. With a spatula, gently fold dry ingredients in 4 additions. On the 4th addition add the 2 Tb of sprinkles and mix until just incorporated. Cover dough with plastic wrap and allow to sit for one hour.