1. Prepare pasta according to package directions, then transfer to a bowl.
2. Wipe out the pasta pot and spray with olive oil cooking spray. Add butter and heat until melted. Add onion and sauté over low heat for 10 minutes, or until golden, stirring occasionally.
3. Add cooking cream and milk and bring to a low boil, until sauce begins to thicken. Add tomato sauce or paste and seasoning and mix well. Add cheese and stir until cheese melts.