2/3 c. melted butter
1 c. brown sugar
4 c. oatmeal
1/2 c. corn syrup
3 tsp. vanilla

Combine all and mix well. Put in 9 x 13 inch pan. Bake 14 minutes at 350 degrees. Melt:

6 oz. chocolate chips
2/3 c. peanut butter

Pour over bars while still warm. Cool and cut into squares.