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The Best Brown Butter Green Bean Casserole Recipe (Easy)

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This brown butter green bean casserole is a showstopper with deep, nutty flavor, a creamy homemade sauce, and a crispy topping that stays crunchy. It’s an easy, impressive side dish perfect for holidays or any gathering.

Ingredients

Scale
  • 2 lbs fresh green beans, trimmed and halved
  • 4 tablespoons unsalted butter
  • 8 oz cremini mushrooms, sliced
  • 2 large shallots, thinly sliced
  • 3 cloves garlic, minced
  • 2 tablespoons all-purpose flour
  • 1 cup whole milk
  • 1 cup heavy cream
  • 1 cup low-sodium chicken or vegetable broth
  • 1/2 cup grated Parmesan cheese
  • 1 teaspoon fresh thyme leaves (or 1/2 teaspoon dried)
  • Salt and freshly ground black pepper, to taste
  • 1 cup panko breadcrumbs
  • 1/2 cup fried shallots or onions
  • 2 tablespoons unsalted butter, melted
  • 1/4 cup grated Parmesan cheese

Instructions

  1. Preheat oven to 375°F (190°C). Bring a large pot of salted water to a boil. Trim and halve green beans.
  2. Blanch green beans in boiling water for 3-4 minutes until bright green and tender-crisp. Drain and rinse with cold water. Set aside.
  3. In a large skillet, melt 4 tablespoons butter over medium heat. Swirl occasionally until butter foams, then milk solids turn golden brown and smell nutty (about 4-5 minutes). Immediately remove from heat and pour into a heat-safe bowl.
  4. Return skillet to medium heat. Add mushrooms and cook 5-7 minutes until browned. Add shallots and cook 2-3 minutes until softened. Add garlic and cook 30 seconds until fragrant.
  5. Sprinkle flour over mushroom mixture and stir constantly for 1 minute to cook out raw flour taste.
  6. Slowly whisk in milk and heavy cream, then broth. Cook, stirring often, for 3-5 minutes until sauce thickens enough to coat the back of a spoon.
  7. Reduce heat to low. Stir in reserved brown butter, 1/2 cup Parmesan, and thyme. Season with salt and pepper. Adjust seasoning to taste.
  8. Add blanched green beans to skillet and stir until well coated. Transfer mixture to a 9×13 inch baking dish and spread evenly.
  9. In a small bowl, combine panko, fried shallots, and remaining 1/4 cup Parmesan. Pour melted butter over and toss until moistened.
  10. Sprinkle topping evenly over casserole. Bake for 20-25 minutes until sauce is bubbly and topping is golden brown and crispy. Let rest 5 minutes before serving.

Notes

Brown butter is key—watch it closely to avoid burning. Blanch beans just until tender-crisp; they will cook more in the oven. For make-ahead, prepare casserole without topping up to 2 days in advance; add topping just before baking and increase baking time by 10-15 minutes. Store topping separately if making ahead to keep it crispy.

Nutrition

Keywords: green bean casserole, brown butter, holiday side dish, Thanksgiving, easy casserole, creamy mushroom sauce, crispy topping

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