1 c. butter
2 c. packed brown sugar
2 eggs
2 tsp. vanilla
3 c. oats
2 1/2 c. flour
1 tsp. baking powder
1 1/2 tsp. salt

TOPPING:

1 c. powdered milk
3/4 c. sugar
1/2 c. cold water
2 tbsp. butter
2 c. chocolate or butterscotch chips

Preheat oven to 350 degrees. Using a mixer, cream butter, brown sugar and eggs. Add remaining ingredients. Pat 2/3 of mixture into 15x10x1 pan, set aside remainder. In another bowl, combine powder milk, sugar and water. Mix until smooth. Melt butter in saucepan. Add milk mixture and chips, heat until chips melt. Pour over cookie base. Crumble remaining cookie base over chocolate layer. Bake 25 to 30 minutes or until bars are done.