Making the Vegan Green Bean Casserole is easy and enjoyable. Just follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Green Beans: In a large pot of boiling water, blanch the green beans for 3-4 minutes until they are bright green and slightly tender. Drain and set aside.
3. Sauté Vegetables: Heat olive oil in a large skillet over medium heat. Add diced onions and sauté for 4-5 minutes until translucent. Add minced garlic and cook for an additional minute.
4. Cook Mushrooms: Stir in the sliced mushrooms and sauté for about 5-7 minutes, until they are tender and have released their moisture.
5. Create Sauce: Sprinkle the flour over the mushroom mixture and stir well. Gradually add the vegetable broth and plant-based milk, whisking to combine. Stir in soy sauce, nutritional yeast, thyme, salt, and black pepper. Cook for about 5 minutes, stirring frequently, until the sauce thickens.
6. Combine Ingredients: In a large mixing bowl, add the blanched green beans and pour the mushroom sauce over them. Mix well to coat the green beans evenly.
7. Transfer to Baking Dish: Pour the green bean mixture into a greased 2-quart baking dish. Spread it out evenly.
8. Add Topping: Sprinkle crispy fried onions on top of the casserole.
9. Bake: Place the casserole in the preheated oven and bake for 30-35 minutes until bubbly and the onions are golden brown.
10. Cool: Once baked, remove from oven and let cool for 5-10 minutes before serving.

With these simple steps, you can easily create a delicious Vegan Green Bean Casserole that everyone will love!