In a large mixing bowl, cream together the softened butter and granulated sugar until light and fluffy.

Mix in the salt, egg yolks, and vanilla extract until well combined.

Gradually add the all-purpose flour to the wet ingredients, mixing until a dough forms.

Fold in most of the crushed peppermint candy, reserving some for topping the cookies.

Shape the dough into small balls, roll the tops in the reserved crushed candy, and place them on the prepared baking sheet, spaced about 2 inches apart.

Bake in the preheated oven for about 12 minutes, or until the edges are lightly golden.

Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.