This recipe offers a convenient slow cooker method for classic green bean casserole. Frozen green beans are combined with cream of mushroom soup, cheddar cheese, and water, then slow-cooked until tender. French fried onions are added towards the end for a crispy topping, making for an effortless and comforting side dish perfect for gatherings.
To elevate this classic, consider using a good quality, low-sodium cream of mushroom soup or making a homemade mushroom béchamel for a richer flavor. For best texture, add half of the French fried onions at the beginning and the remaining half during the last 30-45 minutes of cooking. This ensures some onions soften to meld with the casserole, while others retain their crispness for a textural contrast. Adjust the water amount if using fresh or canned green beans; frozen beans release more liquid. A pinch of garlic powder or a dash of Worcestershire sauce can add depth. For a cheesier crust, sprinkle extra cheddar on top during the last hour of cooking.