
Pour the tomato puree, sauce, tomato paste, and chicken broth into a large pot. Stir together until fully combined and cook over medium heat.
In a measuring cup or small bowl whisk together the milk and gluten-free flour until fully combined. Pour the milk mixture into the tomato mixture and stir together until fully combined.
Add the salt, garlic powder, onion powder, and brown sugar to the soup and stir until combined. Cook over medium heat for 10-15 minutes, or until the soup thickens.
Serve warm and enjoy!