This hearty and refreshing lemony chicken meatball soup is a balance of comfort and lightness. Rolled oats replace traditional breadcrumbs, creating tender meatballs made with ground chicken, Parmesan cheese, and fresh dill. A half-cup of oats is also simmered into the broth, giving it a rich texture and subtle thickness. Packed with vibrant spinach and brightened with the addition of lemon, this soup is a tasty and versatile choice for lunch or dinner.