Try this homemade Best Southern Onion Casserole recipe the whole family will love. Made with margarine, onions, crackers and mushroom soup. Easy step-by…
This Best Southern Onion Casserole relies on simple, everyday ingredients such as (4 oz.) stick margarine, soda crackers, crushed, mushroom soup (undiluted) and eggs. It comes together quickly and makes 4 servings, at about 374 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.
It works as a light main on its own or as a starter alongside crusty bread, and it's just as good for a cozy night in as it is for feeding a crowd. Leftovers keep well, so it's a smart choice for meal prep too.
Updated Jun 30, 2026