In a medium bowl add the butter.
Then add the sugar.
Then add the brown sugar.
Then add the salt
Then add the vanilla.
Now add the milk.
Mix ingredients in medium bowl together with a fork until smooth and fluffy.
Add the flour to the bowl of wet ingredients.
Stir together until just mixed and no dry flour is showing.
Add the sprinkles and stir.
Scoop dough into 1" balls using a spoon or scoop to help shape.
Enjoy at room temperature or cold after placing in the refrigerator.