Try this homemade Easy Casserole (Leftover Roast Beef) recipe the whole family will love. Made with leftover roast beef, potatoes, onion and brown gravy…
This Easy Casserole (Leftover Roast Beef) relies on simple, everyday ingredients such as leftover roast beef, peeled potatoes, onion, sliced and brown gravy mix. It comes together quickly and makes 4 servings. The step-by-step instructions below are written to be easy to follow, even on a busy day.
It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.
Updated Jun 30, 2026