Preheat oven to 350°F and line an 8” x 8” pan with parchment paper and spray with non-stick cooking spray.
Using a whisk, 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 and cocoa powder until just mixed. (Do not over mix or the brownies will turn out cake-like).
Using a whisk, mix the ingredients for the peanut butter brownie layer, again saving the flour, baking powder, and salt for last and stirring until just mixed.
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 minutes. Brownies will still be soft and gooey, but will finish setting while they cool.