Boil the spaghetti noodles.
Slice the onion and mushrooms thinly.
Heat olive oil in a pan and sauté the onion and mushrooms.
Add bacon and stir-fry.
Pour in heavy cream and milk, then bring to a boil.
Add the boiled noodles and mix with the sauce.
Season with salt and pepper.
Finish with a sprinkle of Parmesan cheese.