Cream of mushroom soup is a staple that is used as a base in many homemade dishes. It's well-suited for that or tasty enough to enjoy by itself. If you love cream of mushroom soup but want or need a vegan option, you are in luck. You can make this vegan cream of mushroom soup using vegetable broth, soy milk (or any vegan milk substitute you prefer), and a dairy-free sour cream substitute. This popular dairy-free and vegan mushroom soup is easy and super tasty. It doesn't require any fancy equipment, just some slicing, dicing, sauteeing, and heating on the stovetop. If you want or need this simple homemade mushroom soup recipe to be gluten-free as well as vegetarian and vegan, there's an easy solution. It does call for flour as a thickener, but you could just as easily use an equal amount of cornstarch dissolved in about 2 to 3 tablespoons of water. Use this mixture to thicken it up and keep this cream of mushroom soup completely wheat-free and gluten-free. Also, check to make sure that your vegetable broth is gluten-free as well, as some are, and some aren't. It's also very easy to make your own homemade vegetable broth. That way you'll know exactly what is in it.