While there are brands of gluten free cream of mushroom soup, making a batch of homemade soup is always preferred. It contains more flavor and is healthier as you can control the amount of cream, sodium, etc. This soup may be made using chicken broth or mushroom broth made by soaking dried mushrooms in water (see Tips section). If you are seeking brands of canned mushroom soup, see the link below for my gluten free products list.
Note: If you are sensitive to trace amounts of gluten, do not consume mushrooms. They are often grown on wheat though they usually test well below 20 parts per million.
If you are looking for a commercial brand of gluten-free mushroom soup, check out Progresso’s Gluten Free Creamy Mushroom Soup.