01 -
Preheat oven to 350°F. In a 1 1/2-quart baking dish, mix the cream of mushroom soup, milk, and ground black pepper until well combined.
02 -
Stir in the drained green beans and 2/3 cup of the crispy fried onions. Tip: You can use canned, frozen (thawed), or fresh green beans. If using fresh, blanch them first to ensure they cook evenly with the sauce.
03 -
Bake for 30 minutes or until the mixture is hot. Stir the casserole.
04 -
Top with the remaining 2/3 cup of crispy fried onions and bake for an additional 5 minutes, or until the onions are golden brown. Make-Ahead Tip: To prepare this casserole in advance, complete through Step 1, then cover tightly with plastic wrap and foil to prevent freezer burn. Freeze until ready to serve.
05 -
Thaw overnight in the refrigerator and start with Step 2. Alternatively, bake from frozen by letting the dish stand at room temperature for 10 minutes, then proceed with Step 2, increasing the bake time in 15-minute increments until the center reaches 160°F.