Preheat oven to 325.
Prepare an 8 x 8 pan with parchment. Prepare a cookie sheet with parchment.
In a mixer, cream butter, sugar, and vanilla together until fluffy.
Turn mixer down to low and add flour and salt.
Once it is mixed throughly add the sprinkles.
Press dough in to the pan.
Lift the parchment out of the 8 x 8 pan.
Cut the dough in to 1/2" squares. Move squares to the cookie sheet spacing them 1 1/2 inches apart.
Bake for 15 minutes or until the bottoms start to brown.