1/2 c. crunch-style peanut butter
1/3 c. soft butter
3/4 c. brown sugar
2 eggs
2 tsp. vanilla
1 c. flour
1 tsp. baking powder
1/4 tsp. salt
6 oz. chocolate chips

In large bowl, combine peanut butter, butter, and brown sugar; beat until creamy. Gradually beat in 2 eggs and vanilla. Combine flour, baking powder and salt. Blend into peanut mixture. Spread in greased 9x13 inch pan. Sprinkle with chocolate chips. Place in oven for 5 minutes at 350 degrees. Remove and run knife through to marbelize. Return to oven and bake 25 minutes longer.