PEANUT BUTTER BROWNIES

1/3 cup butter
1/2 cup peanut butter
1 cup sugar
1/4 cup brown sugar
2 eggs
1 cup flour
1 tsp baking powder
1/4 tsp salt
1 cup chocolate chips
1 tsp vanilla

Mix well and bake in well-greased 9" square pan at 350' for 30-35 minutes.