1 c. butter, softened to room temperature
1 c. brown sugar
1 egg yolk
2 tsp. vanilla
1 7/8 c. all-purpose flour
6 milk chocolate bars
1 c. chopped toasted almonds or pecans

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 16x14x1-inch baking pan. Bake at 350 degrees 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.