Green Bean Casserole Recipe for 100 People

Green bean casserole is a classic side dish that combines tender green beans with a creamy mushroom sauce and crispy fried onion topping. Perfect for large gatherings or holiday feasts, this recipe scales effortlessly to serve 100 people, ensuring everyone gets a delicious portion without the hassle of multiple batches.

Ingredients

• Fresh green beans, trimmed and cut into 2-inch pieces – 20 pounds
• Cream of mushroom soup – 10 quarts (about 2.5 gallons)
• Whole milk – 4 quarts
• Soy sauce – 1 cup
• Black pepper – 1/4 cup
• Fried onion rings (store-bought or homemade) – 8 pounds
• Butter – 2 cups (for sautéing onions, if making homemade)
• Fresh mushrooms, sliced (optional, for depth of flavor) – 4 pounds
• Garlic, minced – 1 cup
• All-purpose flour – 2 cups (if thickening homemade mushroom sauce)

Instructions

1. Preheat your oven to 350°F (175°C). Prepare large roasting or baking pans suitable for the volume you’ll be cooking.
2. Cook the green beans: Bring a large pot of salted water to a boil. Blanch the green beans in batches for about 3-4 minutes until tender-crisp. Drain and immediately transfer to ice water to halt cooking. Drain again and set aside.
3. Prepare the mushroom sauce: In a very large stockpot or multiple large pots, melt a portion of the butter over medium heat. Add sliced mushrooms and minced garlic, sautéing until mushrooms are browned and fragrant, about 8-10 minutes. If using, sprinkle flour over the mushroom mixture and cook, stirring constantly, for 2-3 minutes to create a roux.
4. Add the cream of mushroom soup, milk, soy sauce, and black pepper to the mushroom mixture. Stir well to combine and simmer over low heat until the sauce thickens slightly, about 15-20 minutes. Adjust seasoning as needed.
5. Combine the cooked green beans with the mushroom sauce in the large stockpot(s), mixing thoroughly to coat all beans evenly.
6. Transfer the mixture into large, greased baking dishes or roasting pans. Spread evenly.
7. Top the casserole with fried onion rings, distributing them evenly over the surface.
8. Bake in the preheated oven for 25-30 minutes, or until the topping is golden brown and the casserole is bubbling around the edges.
9. Remove from oven and let rest for 5 minutes before serving to allow the casserole to set slightly.

Tips

• Substitutions: Use frozen green beans if fresh are unavailable; just thaw and drain thoroughly before mixing. For a gluten-free version, substitute the flour with cornstarch or gluten-free thickening agents.
• Storage: Store leftovers in airtight containers in the refrigerator for up to 3 days. Reheat in the oven at 350°F for 15-20 minutes or until heated through. For larger quantities, reheat in the oven rather than the microwave to maintain crispy topping.
• Common mistakes: Overcooking the green beans can make them mushy; blanch just until tender. Not draining excess water from thawed green beans can result in a watery casserole. Adding too much liquid during sauce preparation can prevent it from thickening properly.
• Batch cooking: When scaling up, prepare the mushroom sauce in batches or use multiple large pots. Keep cooked beans covered to retain moisture and prevent drying out.

Serving Suggestions

Serve the green bean casserole as a main side dish during holiday dinners, Thanksgiving, or large family gatherings. It pairs well with roasted meats like turkey, ham, or roast beef. Consider offering crusty bread or rolls alongside to complete the meal, and add a fresh salad for contrast.

Variations

• Cheesy Green Bean Casserole: Stir shredded cheese (cheddar, Gruyère, or Parmesan) into the mushroom sauce before baking for an extra savory flavor.
• Vegetarian/Vegan Version: Use plant-based cream of mushroom soup and vegan fried onions. Substitute dairy milk with almond or soy milk, and add nutritional yeast for umami.
• Herb-Infused: Add fresh thyme, rosemary, or parsley to the mushroom sauce for added freshness and aroma.
• Spicy Kick: Incorporate a dash of hot sauce or cayenne pepper into the mushroom sauce for a spicy variation.

Storage and Reheating

Leftover green bean casserole can be stored in airtight containers in the refrigerator for up to 3 days. For best results, cover the dish with foil or plastic wrap before refrigerating. To reheat, preheat your oven to 350°F (175°C) and bake the casserole uncovered for 15-20 minutes until heated through and topping is crispy. If reheating in the microwave, do so in microwave-safe containers in 2-minute intervals, stirring in between, until hot. Do not reheat more than twice to maintain quality and food safety.

Frequently Asked Questions

Can I prepare this casserole ahead of time?

Yes, you can assemble the casserole a day in advance. Cover it tightly with plastic wrap or foil and refrigerate. When ready to serve, bake it at 350°F for 30-35 minutes until hot and bubbly. This makes serving easier during large gatherings.

How do I scale this recipe for 100 people?

Scaling for 100 people involves multiplying ingredient quantities accordingly. Use large commercial-sized pots and pans, and consider preparing the mushroom sauce in batches if necessary. Ensure your oven and serving dishes are large enough to accommodate the volume. Planning ahead helps maintain quality and avoid overcrowding.

What are some good alternatives to fried onions?

If fried onions are unavailable or you prefer a different topping, try crispy bacon bits, toasted breadcrumbs, or crushed potato chips. These options add crunch and flavor, but fried onions remain the most traditional topping for this dish.

Is this dish suitable for gluten-free diets?

Standard recipes contain flour and fried onions that may have gluten. To make it gluten-free, substitute the flour with cornstarch or gluten-free flour blends, and use gluten-free fried onion rings or omit the fried onions altogether, replacing them with toasted nuts or seeds for crunch.

How do I prevent the casserole from becoming too watery?

Drain green beans thoroughly after blanching or thawing. Use a thickening agent like flour or cornstarch in the mushroom sauce. Avoid adding excess liquid, and cook the sauce until it reaches the desired consistency before mixing with the beans. Proper draining and thickening are key to a creamy, not watery, casserole.

What is the best way to keep the topping crispy?

Apply the fried onion topping just before baking to prevent it from becoming soggy. Bake uncovered at 350°F until the topping is golden brown and crispy. Reheating may soften the topping, so consider adding fresh fried onions or crispy elements just before serving if reheating leftovers.

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