In a large pot over medium heat, cook the sausage until browned, breaking it into small pieces. Drain excess grease if needed.
Add the diced onion and cook until softened. Stir in the garlic and cook until fragrant.
Pour in the chicken broth and add the pasta rings. Stir to combine.
Season with Italian seasoning, salt, and black pepper.
Bring the soup to a gentle simmer and cook for 20–25 minutes, stirring occasionally, until heated through and slightly thickened.
Taste and adjust seasoning as needed. Serve hot.