Peanut Butter Brownies

1 c. butter 2/3 c. peanut butter 1 tsp. vanilla chopped nuts 2 c. sugar 4 eggs 2 c. flour butterscotch chips Mix together. Pour into greased 9X13 inch pan. Sprinkle with butterscotch chips and nuts. Bake at 350 for 30 minutes or less.