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Vegan Green Bean Casserole

The Best Vegan Green Bean Casserole

This Vegan Green Bean Casserole features fresh green beans coated in a rich, creamy dairy-free mushroom sauce and topped with crispy fried onions. A plant-based holiday classic everyone will love!
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Prep Time 20 minutes
Cook Time 35 minutes
Total Time 55 minutes
Servings: 8 servings
Course: Side Dish
Cuisine: American
Calories: 215
Ingredients Equipment Method Notes

Ingredients
  

  • 1.5-2 lb fresh green beans, trimmed
  • 3 tbsp olive oil or vegan butter
  • 16 oz cremini or button mushrooms, sliced
  • 1 medium onion, diced
  • 4 cloves garlic, minced
  • 3 tbsp all-purpose flour or gluten-free flour blend
  • 1 cup vegetable broth
  • 1 cup unsweetened almond milk, soy milk, or cashew cream
  • 2 tbsp soy sauce or tamari
  • 3 tbsp nutritional yeast
  • 1 tsp dried thyme
  • salt and black pepper, to taste
  • 1.5 cups crispy fried onions

Equipment

  • Large skillet
  • 9x13-inch baking dish
  • large pot
  • mixing spoon
  • whisk

Method
 

  1. Preheat oven to 375°F. Grease a 9x13-inch baking dish. Bring a large pot of salted water to a boil and prepare an ice bath.
  2. Blanch green beans for 3 minutes, then transfer to ice bath. Drain and pat dry.
  3. Heat oil or vegan butter in a skillet. Add mushrooms with a pinch of salt and cook 8–10 minutes without stirring at first until browned. Add onion and cook 4 minutes, then garlic for 1 minute.
  4. Sprinkle flour over the vegetables and stir constantly for 2 minutes to form a roux.
  5. Slowly pour in vegetable broth while whisking to avoid lumps. Then add plant milk and whisk until smooth. Simmer 5–6 minutes until thickened.
  6. Stir in soy sauce, nutritional yeast, thyme, salt, and pepper. Taste and adjust seasoning.
  7. Add blanched green beans to the skillet and toss until fully coated. Transfer mixture to prepared baking dish.
  8. Bake uncovered for 20 minutes. Top with crispy fried onions and bake an additional 5–7 minutes until bubbling and golden.

Notes

Use gluten-free flour and tamari for a fully gluten-free version. Many store-bought fried onions are accidentally vegan, but always verify labels. Frozen green beans work with careful draining. Make up to 2 days ahead and add onions just before baking.