Line 2 cookie sheets with parchment paper or a silicone pastry mat.
In a large bowl, using a hand-held or stand mixer, cream the butter and 1/2 cup sugar until light and fluffy, about 2 minutes.
Add vanilla, then add flour and salt, mixing just until combined.
Roll dough into one-inch balls, then flatten and place a chocolate candy into the center. Roll the dough up and around the chocolate, forming as much of an even ball as possible. Roll each one in the colored sugar and place onto the cookie sheet at least one inch apart.
Bake for 8-10 minutes, until the bottoms are lightly browned. Let cookies rest on cookie sheet for about 2 minutes before transferring to a wire rack to cool completely.