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

Combine peanut butter, butter, and brown sugar; mix well. Add vanilla and eggs; beat thoroughly. Combine dry ingredients and add to batter; beat well. Transfer mixture to a greased 9 x 13 inch pan; sprinkle chocolate chips on top. Bake at 350 degrees for 5 minutes. Remove from oven and swirl the chocolate into the batter with a knife. Return pan to oven and bake an additional 30 minutes.