Peanut butter brownies

Yesterday, I couldn't find a good recipe for peanut butter brownies, so I created my own:

Jessica's Peanut Butter Brownies

1/2 cup butter, melted
1/2 cup peanut butter (chunky recommended)
2 cups sugar
2 t. vanilla
2/3 cup cocoa
3 eggs
1 cup flour
1/2 t. baking powder
dash of salt

2-4 handfuls of dark chocolate chips, optional

Preheat oven to 350 and grease 9" X 11" pan. Melt butter, stir in peanut butter, sugar, vanilla, and cocoa. Mix in eggs. Add flour and baking powder gradually, stirring until all is well mixed. Bake for 25 min. (I like my brownies undercooked).