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Homemade Green Bean Casserole with Creamy Mushroom Sauce

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A comforting homemade green bean casserole featuring fresh green beans and a creamy mushroom sauce with a crispy fried onion topping, perfect for holidays or weeknight dinners.

Ingredients

Scale
  • 1 ½ pounds (700g) green beans, trimmed and cut into 1 ½-inch pieces
  • 10 ounces (280g) mixed cremini and button mushrooms, finely chopped
  • 4 tablespoons (56g) unsalted butter
  • ¼ cup (30g) all-purpose flour
  • 2 cups (480ml) whole milk
  • 2 cloves garlic, minced
  • 1 teaspoon fresh thyme leaves or ½ teaspoon dried thyme
  • 1 small yellow onion, finely diced
  • Salt and freshly cracked black pepper, to taste
  • 1 cup (30g) French fried onions, homemade or store-bought
  • Olive oil or vegetable oil, for frying onions if making homemade topping

Instructions

  1. Preheat the oven to 350°F (175°C).
  2. Bring a large pot of salted water to a boil. Add the trimmed green beans and cook for 3-4 minutes until bright green and just tender but still crisp. Drain and immediately plunge into ice water to stop cooking. Drain again and set aside.
  3. In a large skillet, melt the butter over medium heat. Add the finely diced onion and sauté until translucent, about 3-4 minutes.
  4. Add the chopped mushrooms and cook until their moisture evaporates and they start to brown, about 6-7 minutes. Stir in the minced garlic and thyme, cooking for another minute until fragrant.
  5. Sprinkle the flour over the mushroom mixture, stirring constantly with a whisk for 1-2 minutes to cook out the raw flour taste. The mixture will thicken and become paste-like.
  6. Slowly pour in the milk while whisking continuously to avoid lumps. Continue cooking and stirring until the sauce thickens and coats the back of a spoon, about 5-6 minutes. Season with salt and pepper to taste.
  7. Add the blanched green beans into the creamy mushroom sauce, stirring gently to coat evenly.
  8. Pour the mixture into a 9×13-inch (23×33 cm) casserole dish, spreading it out evenly.
  9. Sprinkle the fried onions evenly over the casserole. If making your own, fry thinly sliced onions in hot oil until golden and crisp, drain on paper towels, then sprinkle.
  10. Bake in the preheated oven for 20-25 minutes or until the sauce is bubbling around the edges and the topping is golden brown.
  11. Let the casserole cool for 5 minutes before serving to allow the sauce to set slightly.

Notes

Blanch green beans to keep them crisp and vibrant. Sauté mushrooms until browned for deep flavor. Whisk flour into melted butter thoroughly before adding milk to avoid lumps. Add fried onions just before baking or near the end to keep them crispy. Mushroom sauce can be made a day ahead and refrigerated.

Nutrition

Keywords: green bean casserole, homemade green bean casserole, creamy mushroom sauce, holiday side dish, Thanksgiving recipe, mushroom casserole, fried onion topping

Find it online: https://lucastable.com/homemade-green-bean-casserole-with-creamy-mushroom-sauce-recipe-perfect-for-holidays/