1Heat oven to 350°F.
2In medium bowl, stir butter, chocolate and powdered sugar with spoon. Stir in egg. Stir in flour, baking soda and salt. Cover and refrigerate dough at least 15 minutes but no longer than 30 minutes.
3Shape dough into 1-inch balls. Place about 2 inches apart on ungreased cookie sheet.
4Bake 7 to 9 minutes or until almost no indentation remains when touched lightly in center. Cool 1 minute; remove from cookie sheet to wire rack. Immediately top with candies (candies will melt slightly).