1 c. butter, room temperature
1 c. brown sugar
1 egg yolk
2 tsp. vanilla
1 7/8 c. flour
6 milk chocolate bars (1.65 oz. each)
1 c. toasted almonds or pecans

Preheat oven to 350 degrees. In mixing bowl, cream together butter and brown sugar until light-colored and fluffy. Add egg yolk and vanilla; gradually beat in flour until smooth and blended. (Dough will be thick.) Spread evenly on ungreased 16"x14"x1" baking pan. Bake for 15 minutes or until crust is golden brown and puffy. Remove from oven. Arrange unwrapped chocolate bars evenly over surface of crust; let stand for 5 minutes to soften. Spread chocolate evenly over crust; sprinkle with chopped nuts. Cool; cut into squares.