Preheat oven to 350F; line an 8 by 8-inch baking pan with parchment paper.
Beat together the peanut butter, oil, water, egg, egg yolks, vanilla, dissolved espresso, and stevia glycerite in a large bowl.
Sift in the cocoa powder, Serve Confectioners, salt, and baking powder and mix to combine (the batter will be thick).
Spread the batter into the prepared baking pan. Bake for 15 to 18 minutes, 15 for gooey brownies and 17 for more set. If you let these brownies cook until a wooden pick comes out dry, they’ll be overcooked.
Cool the brownies completely before frosting.
For the frosting, cream together the cream cheese, butter, and peanut butter in a large bowl. Beat in the Swerve Confectioners, stevia glycerite, and vanilla extract until fully incorporated. Lastly, beat in the cream until smooth. Cover and refrigerate 1 hour so the frosting can stiffen a bit, and then briefly beat it again before frosting the brownies.
Once the brownies are cool, spread the cheesecake frosting on top.
Serve, or store wrapped in the fridge for up to 5 days before serving.