1-Pan Mushroom Potato Casserole A cozy, hearty mushroom potato casserole that needs just 1 pan. Layers of rich mushroom gravy with beans and veggies, layered with crisp garlic herb potatoes that take only minutes to put together as the oven does all the work. (gluten-free with soy-free and nut-free options) The post 1-Pan Mushroom Potato Casserole appeared first on Vegan Richa.