Here's my recipe. Takes me about 1 minute to put together, another minute to microwave.

2 Tbl of unsweetened Cocoa powder
1/2 Tsp of baking powder
1 Egg
Equivalent of 2 Tbl of sweetener, wet or dry, doesn't matter.

In a cereal bowl, mix dry ingredients together with a fork. Crack the egg on top. Kind of beat the egg in place until yolk and white are pretty well blended. Then begin mixing the egg into the dry ingredients. If you use a dry form of sweetener (like splenda) you'll probably need to add 1 Tbl of water, cream, oil, something like that. If you used a syrup sweetener, like Torani on Da Vinci, you can most likely skip that.

Microwave for about 1 minute. Until just set up, you don't want to overcook!

Variations, mix a few bits of very dark chocolate in, I shave some off a 85% bar. Use various flavors of syrup. Throw raspberries in, increase cooking time possibly. Put a pat of butter on top after cooking.