Homemade gluten-free cream soups aren't hard to make and gluten-free sweet rice flour is an excellent thickener Gluten-free cream of mushroom soup takes less than 20 minutes to make, with a creamy fresh flavor. Simply made with mushrooms, onions, garlic, cream, and using gluten-free flour and chicken broth, then topped with fresh basil. Gluten-free cream of mushroom soup is a versatile recipe because you can use it to make classic dishes like gluten-free tuna casserole and other casserole dishes. If eating as a soup, enjoy it with a tossed salad for a complete meal.