I love making Vegan Broccoli Casserole because the creamy mushroom sauce tastes so rich without any dairy. The sauce is made with garlic, nutritional yeast, and vegetable broth, and it coats tender broccoli florets perfectly with crispy fried onions on top for crunch. I make this for Thanksgiving, Christmas dinner, holiday potlucks, and weeknight dinners because it's hearty enough to satisfy everyone at the table. It's also freezer-friendly for up to 3 months.