1 cup Butter
1 cup Brown Sugar
1 Egg yolk
1 teaspoon Vanilla
2 cups Flour
1/4 teaspoon Salt
6 Hershey Milk Chocolate Bars
Beat butter, brown sugar, egg yolk and vanilla together until creamy. Slowly add flour and salt until well blended.
Bake at 325 for 13 minutes or until lightly browned. It will be soft, do not over bake.
Remove from oven and immediately place unwrapped chocolate bars on top of hot cookie base.
Let it stand a few minutes until chocolate is melted. Spread melted chocolate evenly to cover entire cookie base. Cut into squares after chocolate has cooled and set.