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Golden brown thanksgiving green beans casserole with crispy fried onions and melted cheese in white baking dish

Thanksgiving Green Beans Casserole

This elevated Thanksgiving Green Bean Casserole transforms the classic holiday side into a show-stopping dish. With fresh green beans, creamy sauce, earthy mushrooms, and crispy fried onions, it’s a restaurant-quality version that honors tradition while adding gourmet flair to your holiday table.
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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 8 servings
Course: Side Dish
Cuisine: American
Calories: 230
Ingredients Method Notes

Ingredients
  

  • 1.5 lbs fresh green beans trimmed and halved
  • 8 oz cremini or button mushrooms finely sliced
  • 3 cloves garlic minced
  • 2 tbsp unsalted butter
  • 1 tbsp olive oil
  • 1 can 10.5 oz condensed cream of mushroom soup
  • 1/2 cup low-sodium chicken or vegetable stock
  • 1/2 cup half-and-half or whole milk
  • 1 tsp kosher salt
  • 1/2 tsp black pepper
  • 1/2 tsp smoked paprika optional
  • 1 tsp soy sauce or Worcestershire
  • 1 cup shredded sharp cheddar optional
  • 1.5 cups crispy fried onions divided
  • 1/4 cup grated Parmesan optional
Substitutions:
  • Use frozen green beans reduce blanching to 2 minutes
  • Replace soup with homemade béchamel for gourmet flavor
  • Plant-based butter and cashew cream for dairy-free version

Method
 

  1. Preheat oven to 375°F (190°C) and grease a 9x13-inch baking dish.
  2. Blanch green beans in salted boiling water for 3–4 minutes until crisp-tender. Transfer immediately to ice bath, drain, and dry thoroughly.
  3. In a skillet, melt butter and olive oil over medium heat. Add mushrooms and cook 5–6 minutes without stirring for proper browning. Add garlic and cook 30 seconds until fragrant.
  4. Stir in condensed soup, stock, and half-and-half. Add salt, pepper, paprika, and soy sauce. Simmer 2–3 minutes until thickened. Stir in cheddar cheese if using.
  5. Combine green beans with sauce and 1/2 cup fried onions, mixing gently to coat evenly.
  6. Transfer mixture to prepared baking dish. Top with remaining fried onions and Parmesan.
  7. Bake 15–20 minutes until bubbling and golden. Tent with foil if onions brown too quickly.
  8. Rest 5 minutes before serving to allow sauce to set.

Notes

For best results, blanch beans only 3–4 minutes and use fresh mushrooms for depth of flavor. Make ahead up to 2 days (without onion topping) and refrigerate. Add fried onions before baking for maximum crispiness.