Preheat oven to 350.
Prepare 2 cookie sheets with parchment paper. Put the sprinkles in a bowl you can roll the cookie dough in. Set aside.

Cream together butter, sugar & vanilla until light & fluffy. Add the salt & slowly add the flour. Mix until flour is completely incorporated into the dough. Dough is ready when a scoop of dough will stay together after being rolled into a ball.

Scoop out tablespoons of dough, roll them into a ball and then roll the ball in the sprinkles. Place balls about 1-1/2 inches apart onto the parchment. Make a slight indent in the top of each ball with your finger or the end of a round kitchen tool. Do not completely press the cookies flat because they will crack.

Bake cookies for 10 minutes. Remove from oven & make a deeper indent in the tops of each cookie using the end of a kitchen tool. Bake until the cookies are set but are not browned. If they bake too long they will become hard & dry. Allow to cool completely before frosting.

For the frosting: m