This Chocolate Protein Mug Cake tastes like an indulgent dessert and takes only 2 minutes to whip up. With 15g of protein per serving, it's a sugar-free treat you can feel good about.
In a small bowl, whisk together the nut butter, sweetener, and vanilla extract. Whisk in the egg white, then whisk in the protein powder, cocoa powder, baking powder, and salt.
Add the water or coffee a little at a time until the mixture is like a thick cake batter.
Divide between two mugs (at least 3/4 cup capacity) and top with chocolate chips, if using.
Cook each mug cake on 50% power for 1 minute, watching carefully so that it doesn't overflow. Check the cake and cook another 30 seconds, if necessary. It should be set on the sides but still a little wet-looking in the middle. Do not overcook.
Remove and let cool a few minutes before eating.
Notes
For a truly gooey, delicious protein mug cake, make sure you don't overcook it. 50% power usually helps keep it from overcooking and drying out. If the cake is puffing up and looks like it might overflow the mug, stop the microwave for a few seconds, and then restart it again.