Spaghetti Carbonara

1/2 pound vermicelli
1/2 pound fresh mushrooms, sliced
1/4 cup olive oil
2 tablespoons butter
1 cup diced Canadian bacon
1 cup diced ham steak
6 tablespoons freshly-grated Parmesan cheese
2 eggs, well beaten
Additional grated Parmesan cheese

Cook spaghetti according to directions on the package; drain well, and keep hot. Saut