• Preheat the oven to 350 degrees F. Line an 8 x 8 or 9 x 9 inch square baking dish with parchment paper and set aside.

Brownie Layer

• In a large bowl, whisk together the sugar, flour, cocoa powder, salt, and baking powder. Make a well (hole) in the center and drop in the butter, eggs, and vanilla extract. Mix together thoroughly and then fold in the chocolate chips with a rubber spatula. Spread in one even layer on the bottom of the parchment-lined baking dish.

Peanut Butter Layer

• In another large bowl, mix together everything except the chocolate chips until thoroughly combined. Fold in the chocolate chips.
• Carefully spread on top of the brownie layer in the baking dish. I find it's best to drop clumps in various locations on top of the brownie batter to help get an even spread without mixing the two together.
• Bake until golden brown on top, about 30 to 35 minutes. Let cool. Holding the parchment paper, lift out of the pan. Cut into squares and enjoy!