Yum Yum Bars - cooking recipe

Ingredients

1/2 c. butter
1 c. brown sugar
1 c. flour
1/2 tsp. vanilla
1 egg yolk
5 plain Hershey candy bars

Preparation

Mix all ingredients except candy bars.
Bake in a greased pan at 350\u00b0 for 20 minutes.
Remove and put broken candy over top. Spread over the top when melted.
Do not overbake.