Peel and chop vegetables and mushrooms. Cut the bacon into squares.
Place bacon and onion in a heated frying pan, greased with oil.
When the onion turns golden, add the mushrooms. When the excess water from the mushrooms has boiled away, add cream to the pan. After a while, add grated hard cheese to the pan.
Heat up the water for the spaghetti. Cook the pasta until almost done, drain the water and place the spaghetti in the pan. Stir. Add salt, pepper and your favorite seasonings to taste.
Divide the pasta into bowls and sprinkle with grated cheese.