In a pot, mix cream soup mix with water and bring to a boil while stirring.

Add milk to the pot and stir. Prepare onions, mushrooms, or other preferred vegetables and add them to the mixture.

Prepare 1 serving of spaghetti according to the package instructions.

Boil the spaghetti in hot water until cooked.

Mix the cooked spaghetti into the cream sauce and stir for 2–3 minutes until well combined.