Necessary mug (safe for the microwave), it added the flour, sugar, cocoa and mix everything thoroughly.

Add the egg, and again mix everything. Pour in the milk, butter, vanilla, carried out the final stirring, add chocolate chips (optional).

Now safely place the mug in the microwave for 3 minutes, with a power – 1000W. Don't worry if the cake will rise over the mug – this is normal. The finished cake pour the whipped cream/syrup/cherries to decorate or just eat straight from the mug.