I was in Waitrose yesterday and was goign to buy two stuffed mushrooms but decided at the time I could easily make them myself so bought 2 Portabello mushrooms, gruyere chees, cheddar, garlic and one big tomato and can remember I need breadcrumbs now I have all of this I don't really know what to do - anyone got any ideas or has anyone done this before if so any help would appreciated otherwise I woudl have wasted a few pound on ingredients (those mushrooms aren't cheap)