1 c. butter, soft
1 c. brown sugar
1 egg yolk
2 tsp. vanilla
1 (7/8 c.) all-purpose flour
6 milk chocolate bars (1.65 oz. each)
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 16 x 14 x 1 inch baking pan. Bake at 350 degrees for 15 minutes or until 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 nuts. Cool. Cut in squares.