Hershey Slims

1 cup granulated sugar
1/2 cup flour
1/4 teaspoon salt
2 (1 ounce squares) unsweetened chocolate
8 ounces butter
2 eggs
1 teaspoon vanilla extract
Walnuts (optional)
Confectioners sugar

Melt butter and chocolate over low heat. Mix dry ingredients in a bowl. When chocolate and butter have melted, mix with dry ingredients. Add eggs and vanilla extract. Add walnuts (optional). Bake on a greased cookie sheet (one with sides) at 350 degrees F for 10 to 12 minutes. When cool, sift confectioners' sugar over them and cut into squares.