Wash 3 or 4 potatoes, dry them with a cloth.
Pierce the skin several times with a knife.

Rub the outside with a splash of olive oil (you can sprinkle salt if you prefer) i didn't.
Microwave on high for 6-7 mins.
Poke with a knife to test doneness. If not done return to the microwave for 2 mins at a time.

Spkit open and top with a knob of butter each. Stuff with mushroom sauce and top with cheese.