1/2 c. peanut butter
1/3 c. butter
3/4 c. light brown sugar
3/4 c. regular sugar
2 eggs
2 tsp. of vanilla
1 c. flour
1 tsp. baking powder
1/4 tsp. salt
2 c. chocolate chips

Preheat oven to 350°F. Combine peanut butter, butter, brown sugar, sugar. Beat until creamy. Add eggs and vanilla, beat until combined. Add flour, baking powder, salt and beat until blended. Spread into greased 13 x 9 inch pan. Sprinkle 2 cups chocolate chips over surface.

Bake 5 to 7 minutes (to melt chips). Remove from oven and run knife through chips until marbleized. Return to oven to bake 20 to 25 minutes. Put toothpick in center. If it comes out clean it is done.