Boil spaghetti in salted water until al dente, then drain.

Slice mushrooms and cut ham/bacon into small pieces.

Heat olive oil in a pan, sauté garlic (if using), then add mushrooms and ham/bacon.

Cook until mushrooms are soft and ham/bacon is slightly crispy.

Add cream or milk, salt, and pepper. Simmer for 1-2 minutes.

Toss in the cooked spaghetti and mix well.

Serve with parmesan cheese if desired.