1/2 c. crunchy peanut butter
1/3 c. butter, softened
3/4 c. brown sugar
3/4 c. granulated sugar
2 eggs
2 tsp. vanilla
1 c. sifted flour
1 tsp. baking powder
1/4 tsp. salt
1 c. chocolate chips

In a large bowl, combine peanut butter, butter, and sugars. Beat until creamy. Beat in eggs and vanilla. Blend in flour, baking powder and salt. Spread in a greased 9 x 13 inch pan. Sprinkle chips on top. Place in a 350°F oven for 3 minutes. Remove from oven. Run knife through to marbelize. Return to oven and bake for 20 minutes.