Method

1. Line an 8x8-inch baking pan with parchment paper, with an overhang for easy removal. Prepare the brownie batter as directed for fudge-like brownies. Bake the brownies as directed and let cool in the pan.
2. In a small saucepan, over medium heat, melt together peanut butter and butter. Stir in vanilla and salt.
3. Stir in powdered sweetener, a little at a time, until the mixture thickens to a spreadable consistency. Spread over cooled brownies and refrigerate 1 hour, until set.
4. In a small saucepan, heat the cream until just simmering. Remove from heat and add the chopped chocolate. Let sit 5 minutes to melt.
5. Add the sweetener and vanilla and whisk until smooth. Let sit a few minutes to thicken, then spread over the peanut butter layer.
6. Lift brownies out by edges of parchment paper and cut into squares.