I always use Kosher salt in my kitchen! If using table salt, start with half the amount and adjust to taste, as it is much "saltier" by volume.
Instructions
In a small bowl combine the baking soda and sour cream. Set aside until needed.
In the bowl of a mixer, fitted with the paddle, cream together the butter and sugar, approximately 5 minutes. Until the mixture has become paler in color and is completely creamed.
Next add in the salt, vanilla, baking powder and egg. Mix for 1 minute on medium speed. Add in the sour cream mixture and mix until fully combined.
Finally, add in the flour and sprinkles and mix just until the flour is incorporated. Cover the bowl and refrigerate overnight.
Preheat an oven to 350° F and line a baking sheet with parchment paper. Using a .5-ounce portion scoop, scoop out the cookies and place on the prepared baking sheet.
Gently press each cookie dough ball into the remaining sprinkles, flattening out the cookie slightly as your press. Place back on the baking sheet and bake for 10-12 minutes. The cookies are ready when the edges have just a hint of browning. Enjoy!
Notes
VERY IMPORTANT! This cookie dough needs to be chilled overnight in the refrigerator.