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Cozy Brown Butter Green Bean Casserole with Crispy Shallots

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A nutty, deeply savory green bean casserole with a creamy brown butter sauce and impossibly crispy shallots. This elevated side dish transforms a classic into the star of any cozy gathering or holiday table.

Ingredients

Scale
  • 2 pounds fresh green beans, trimmed and cut into 2-inch pieces
  • 4 tablespoons unsalted butter
  • 8 ounces cremini mushrooms, sliced thinly
  • 3 cloves garlic, minced
  • 2 tablespoons all-purpose flour
  • 1 ½ cups whole milk, warmed
  • ½ cup heavy cream
  • ½ teaspoon salt, plus more for blanching water
  • ¼ teaspoon black pepper, freshly ground
  • ¼ teaspoon nutmeg, freshly grated
  • 3 large shallots, thinly sliced into rings (about 1 ½ cups)
  • ⅓ cup all-purpose flour
  • ½ teaspoon salt
  • ¼ teaspoon smoked paprika (optional)
  • ½ cup neutral oil for frying

Instructions

  1. Preheat oven to 375°F. Bring a large pot of salted water to a rolling boil.
  2. Blanch the green beans: Drop trimmed beans into boiling water and cook for exactly 3 minutes. Transfer immediately to an ice bath for 2 minutes, then drain and pat dry. Set aside.
  3. Make the crispy shallots: Heat ½ cup neutral oil in a small saucepan over medium heat. Toss sliced shallots with ⅓ cup flour, ½ teaspoon salt, and smoked paprika. Fry in batches for 2-3 minutes until deep golden brown. Transfer to paper towels and sprinkle with salt. Set aside.
  4. Brown the butter: In a large skillet, melt 4 tablespoons butter over medium heat. Swirl occasionally until it foams, subsides, and brown specks appear (about 4-5 minutes). Remove from heat immediately and pour into a heatproof bowl, leaving burnt bits behind.
  5. Cook the mushrooms: Return skillet to medium heat with 1 tablespoon browned butter. Add mushrooms and cook without stirring for 2 minutes, then stir and cook 3-4 minutes until golden. Add garlic and cook 30 seconds. Season with salt and pepper.
  6. Make the sauce: Reduce heat to medium-low. Add remaining browned butter to skillet. Sprinkle flour over top and whisk constantly for 1 minute. Slowly pour in warm milk while whisking. Add heavy cream, salt, pepper, and nutmeg. Whisk until thickened, about 3-4 minutes.
  7. Assemble the casserole: Add blanched green beans to skillet with sauce and stir to coat. Pour into a 9×13-inch baking dish. Sprinkle half the crispy shallots on top.
  8. Bake for 20-25 minutes until bubbly and edges are browning. Remove from oven, top with remaining shallots, and let rest 5 minutes before serving.

Notes

Don’t rush the brown butter—watch closely as it goes from brown to burnt quickly. Blanch beans properly with an ice bath to lock in color. Fry shallots in batches to avoid sogginess. Warm milk before adding to roux to prevent lumps. Let casserole rest 5 minutes before serving to allow sauce to set.

Nutrition

Keywords: green bean casserole, brown butter, crispy shallots, Thanksgiving side dish, holiday recipe, comfort food, vegetarian side dish

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