1/2 c. crunchy peanut butter
1/3 c. butter, softened
3/4 c. brown sugar
3/4 c. white sugar
2 eggs
2 tsp. vanilla
1 c. unsifted flour
1 tsp. baking powder
1/4 tsp. salt
1 (12 oz.) pkg. semi-sweet chocolate (2 c.)

Preheat oven to 350 degrees. Combine peanut butter, butter, brown sugar, and sugar. Beat until creamy. Gradually add eggs and vanilla. Blend in flour, baking powder, and salt.

Spread in greased 9x13x2 pan. Sprinkle chocolate chips over top. Bake for "3 minutes". Remove, run knife through to marbelize. (Swirl knife through vertically.) Return to oven for 30 minutes.