Try this homemade A.1. Fireside Mushroom-Onion Cheddar Burger recipe the whole family will love. Made with mushrooms, onion, Hearty Sauce and lean groun…
This A.1. Fireside Mushroom-Onion Cheddar Burger relies on simple, everyday ingredients such as sliced fresh mushrooms and small onion, thinly sliced. It comes together quickly and makes 4 servings, at about 1282 kcal each. 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