Preheat oven to 350°F. Line an 8” x 8” pan with parchment paper and spray with non-stick cooking spray.
In a medium sized bowl, mix the ingredients for the peanut butter brownie layer, saving the flour, baking powder and salt for last and stirring in until just mixed.
Mix all the ingredients for the chocolate layer in a large mixing bowl, adding in the flour, cocoa powder, and salt last. Lightly fold in the flour, cocoa powder and salt until just mixed. (Do not over mix)
Spread peanut butter brownie layer on the bottom of the pan and top it with the chocolate brownie layer, spreading the batter for both layers out evenly.
Bake for 22-25 minutes. Brownies will still be soft and gooey, but will finish setting while they cool.