Brown hamburger in skillet, add onion. Cook macaroni following package directions, but leaving slightly underdone.
Preheat oven to 350°F. Put in casserole dish and mix all together.
Bake at 350°F for 30 minutes making sure dish is covered.
Optional: Add bread crumbs to the top of the dish being baked.
Optional: 3 cups of cooked noodles.
Submitted by: Kathy Kopczynski.