Chocolate Frosted Bar Cookies - cooking recipe

Ingredients

2 c. butter
1 c. white sugar
1 c. brown sugar
2 tsp. vanilla
4 egg yolks
2 c. flour
2 c. oatmeal
1 large pkg. chocolate chips

Preparation

Cream first 5 ingredients together until light.
Add flour and oats.
Spread into jelly roll pan.
Bake at 350\u00b0 for 20 to 25 minutes.
Immediately upon removing from oven, sprinkle with chocolate chips.
Spread over top when melted.
Sprinkle with chopped nuts (optional).