Heat oven to 400 degrees. Beat butter, ½ C powdered sugar and the vanilla in a large bowl with electric mixer on medium speed.Mix ¼ C of the crushed peppermint candies in with the flour and salt,& save the remaining candies. Stir in the flour mixture.
Shape dough into 1 inch balls. Place about 2 inches apart on an ungreased cookie sheet.
Bake 8-9 minutes or until set but not brown. Immediately remove from the cookie sheet; roll in powdered sugar. Wait 10 minutes then roll in the remaining candy. Reroll if desired.