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Gluten Free Green Bean Casserole

This gluten-free green bean casserole is a healthier, dairy-free twist on a beloved holiday classic. With fresh green beans, a creamy mushroom sauce, and a crunchy topping, it’s perfect for Thanksgiving, Christmas, or any special occasion.
Prep Time:15 minutes
Cook Time:30 minutes
Total Time:45 minutes
Cuisine: American
Keyword: Gluten-free green bean casserole
Servings: 6

Ingredients

  • 1 lb fresh green beans trimmed and cut into 1-inch pieces
  • 1 tbsp olive oil
  • 1 cup mushrooms sliced
  • 2 cloves garlic minced
  • 2 tbsp gluten-free flour or cornstarch
  • 1 cup plant-based milk almond, oat, or cashew
  • 1 tsp salt
  • 1/2 tsp black pepper
  • 1/4 tsp nutmeg optional
  • 1 large onion thinly sliced
  • 1 cup gluten-free breadcrumbs or crushed nuts

Instructions

Prepare the Green Beans:

  • Boil salted water in a large pot. Blanch green beans for 2–3 minutes until tender. Drain and transfer to an ice bath to preserve their color and crunch.

Make the Mushroom Sauce:

  • Heat olive oil in a skillet. Sauté mushrooms until golden. Add garlic and cook for 1 minute.
  • Sprinkle gluten-free flour over mushrooms and stir. Gradually add plant-based milk, whisking until the sauce thickens. Season with salt, pepper, and nutmeg.

Prepare the Crispy Topping:

  • Toss onion slices in gluten-free breadcrumbs, garlic powder, and a pinch of salt. Spread on a baking sheet and bake at 400°F for 15–20 minutes until golden.

Assemble the Casserole:

  • Preheat oven to 350°F. Combine green beans and mushroom sauce in a casserole dish. Top with crispy onions.
  • Bake for 20–25 minutes until bubbly and golden.

Notes

  • Make-Ahead Tips: Prepare green beans and sauce up to 3 days in advance. Store separately in the fridge.
  • Storage: Refrigerate leftovers for up to 3 days or freeze for up to 1 month. Reheat at 350°F until warmed through.
  • Variations: Substitute slivered almonds with pumpkin seeds for a nut-free option, or add caramelized onions for extra sweetness.