Preheat oven to 350 degrees.
Prepare spaghetti according to package directions.
Fry bacon.
Saute onion.
Combine cooked spaghetti, bacon, onion, tomato sauce and desired spices in casserole dish and mix together. Top with shredded cheese.
Bake at 350 degrees for 30-45 minutes or until cheese is brown on top.