If you are trying to watch your waistline but love pasta, try substituting spaghetti squash for the noodles. It'll amaze you and this recipe proves it.
Preheat oven to 375 degrees F. Drizzle olive oil over cut sides of spaghetti squash and season with salt and pepper. Roast, cut side up, for 45 minutes. Using a fork, scoop squash out to form "noodles".
Brown ground beef and onions until no longer pink; drain.
Mix hamburger and spaghetti sauce and simmer until hot.
Either serve immediately topping spaghetti squash with sauce or place squash strands in a greased casserole dish, top with sauce grated cheese, if desired. Bake at 350° for about 30 minutes.