Boil some water and soak the mushrooms in it for half an hour off the heat. In a pan heat 2 tbsp of olive oil, a knob of butter and the chopped onion. Drain the mushrooms; add them and the ham, in little pieces.Cook for few minutes and then add the wine.  Let it evaporate; add salt and pepper and a spoon of vegetable stock. Add also few tbsp of cream. Cook penne, drain them and add to the creamy sauce. Add the parmesan cheese and serve.