Toffee Squares

Directions

1. 1
   In mixing bowl cream together butter and brown sugar until light.
2. 2
   Add egg yolk and vanilla, gradually beating in flour until smooth and blended (dough will be thick).
3. 3
   Spread evenly on an ungreased jelly roll pan (cookie sheet with sides).
4. 4
   Bake at 350° for 15 minutes or until crust is golden brown and puffy.
5. 5
   Remove from oven.
6. 6
   Arrange chocolate bars evenly over surface, let set 5 minutes to soften.
7. 7
   Spread chocolate and sprinkle top with chopped nuts.