Prep: Preheat oven to 350 F. Grease an 8-in pan, and line with parchment.
Mix: Stir all cake ingredients together very well, then spread into the pan.
1 1/2 cups almond flour, 1/4 cup cocoa powder, 2 1/4 tbsp baking powder, 2 tbsp dark cocoa powder, 1/2 tsp salt, 1/3 cup water or milk of choice, 3 eggs, 1/3 cup granulated erythritol, 1 1/2 tsp pure vanilla extract
Place peanut butter, erythritol, and butter into a small microwave safe ramekin. Microwave on high for 30 seconds, just enough to soften. Remove from microwave, stir until mixed well. drizzle over cake batter
Bake: Bake 14 minutes on the center rack (some ovens require more baking time, so continue cooking until firm if needed).
Place chocolate chips, erythritol, and butter into small microwave safe ramekin. Microwave for 30 seconds, being careful not to overcook--just enough to melt chocolate--it may not look melted but should easily mix together. Stir well and drizzle over cake.