Preheat oven to 325.
Prepare 9X9 baking pan by lightly spraying with cooking spray or lining with foil and lightly spray.
Whisk together flour, baking powder, and salt in a separate bowl, and set aside.
Melt chocolates in the microwave according to melting directions.
Whisk granulated sugar into chocolate mixture.
Add eggs, and whisk until mixture is smooth.
Stir in vanilla
Add flour mixture; mix until well incorporated.
Pour mixer into a 9×9 baking pan.
Bake for 35-40 minutes or until done
Place peanut butter & chocolate in a seperate plastic bag and cut tip.
Make lines of peanut butter and alternate with chocolate frosting over the top.
Top with a peanut butter cup.