I've never tried mushroom and cheese either, but it sounds lovely. I bet it thickens it very nicely...
I made a mushroom soup from the boiled down remains of a slow-cooked piece of beef once. It sounds a bit disgusting, but it was really hearty and delicious!
Minestrone is another beautiful winter soup, particularly in a mug in front of a fire when it's raining...
Yum onion soup, how could I forget that, alicefalling And Momo, I must admit I cheat - I usually get a tin of tomato soup and pour some orange juice - stir, pour, ready! Must also try adding cheese to mushroom soup