Follow these steps to create your own delicious Italian Wedding Soup:

1. Prepare the Meatballs: In a mixing bowl, combine the ground beef, Italian sausage, breadcrumbs, Parmesan cheese, parsley, egg, garlic powder, onion powder, salt, and pepper. Mix until well combined.
2. Form Meatballs: Roll the mixture into small meatballs, approximately 1 inch in diameter.
3. Brown Meatballs: In a large pot over medium heat, add a little oil and brown the meatballs on all sides. Remove them from the pot and set aside.
4. Sauté Vegetables: In the same pot, add the diced carrots, celery, and onion. Sauté for about 5 minutes until the vegetables soften.
5. Add Broth: Pour the chicken broth into the pot. Bring it to a boil.
6. Cook Meatballs: Once boiling, reduce the heat to simmer. Add the browned meatballs back into the pot and let them cook for about 20 minutes.
7. Season the Soup: Stir in oregano and red pepper flakes, if using. Season with salt and pepper to taste.
8. Add Greens: A few minutes before serving, add the spinach or escarole. Cook just until the greens wilt.
9. Adjust Consistency: If the soup is too thick for your liking, add an additional cup of broth or water.
10. Taste and Serve: Adjust seasonings if necessary, and your Italian Wedding Soup is ready to enjoy!