In a bowl mash the banana, mix it with icing sugar, vanilla sugar, beat the egg, add soft butter, flour and baking powder.

All stir well, obtain a fairly liquid batter.

Now it only remains to put it in a Cup and put it in the microwave. If you cook all at once, the cooking time needs to be increased to 3.5 to 4 minutes at a power of 850 watts. If you divide the dough into two portions, then it is enough for 2.5 minutes. While baked cake, prepare sauce. To do this in a saucepan heat the sugar until a rich Golden color ( I got a little burnt, but the taste is not affected ).

Remove sugar from heat and immediately add butter and cream. Here such it turns out the sauce.

Take out the muffin from the microwave, pour the sauce and ate!