Slow Cooker Wild Rice and Mushroom Soup Creamy, comforting, and filled with earthy mushrooms, vegetables, and tender wild rice. Ingredients 1 cup uncooked wild rice 1 pound mushrooms sliced 1 onion diced 3 garlic cloves minced 3 carrots diced 3 celery stalks diced 6 cups chicken broth or vegetable broth 1 teaspoon salt 1 teaspoon black pepper 1 teaspoon dried thyme 1 teaspoon paprika 2 tablespoons olive oil 1 cup heavy cream or half and half 2 tablespoons cornstarch mixed with 3 tablespoons wate