Mix all dry ingredients in one bowl: flour, sugar, soda, cocoa ..
In another bowl, mix all the liquid components: liquid, vegetable oil, vinegar.
Mix dry ingredients well.
Pour liquid into the dry mixture. To stir thoroughly.
Pour the dough into an ovenproof dish. I do not lubricate it with anything. Send to microwave. Bake for 6 minutes at maximum power.
Do not disturb the finished biscuit in the microwave after baking for another 5 minutes. After that we take out the form. We carefully extract our biscuit from it.
If you wish, you can sprinkle the lean biscuit with powdered sugar.