Total Calories: 717
Preheat oven to 375°.
In a medium saucepan over low heat, melt butter and chocolate. Stir and set aside to cool for 5 minutes.
Stir in sugar, egg, vanilla and salt until blended. Stir in flour and nuts. Shape mixture into 1-inch balls. Place 2 inches apart on ungreased baking sheets.
Bake for 8 to 10 minutes or until set. While still warm, roll in powdered sugar. Cool on wire racks. Roll in powdered sugar again.
Store in an airtight container.