In a large pot of Dutch Oven, heat 1-2 TBSP olive oil over medium high heat. Sauté the carrots, celery and onions for 5-7 minutes until softened. Stir in garlic, 1/4 tsp red pepper flakes and 2 TBSP of the fresh herbs and cook 1-2 minutes more. Season vegetables with kosher salt.
Carefully spoon in the roasted meatballs and any drippings from the rimmed baking sheet. Simmer on low for 10 minutes.
Stir in chicken stock. Bring to a boil and add pasta, beans and greens- kale, escarole whatever you prefer. Reduce heat and simmer 10 more minutes.
Ladle soup into serving bowls and garnish with additional red pepper flakes ( if desired) chopped herbs and grated pecorino.
You may want to add more broth to the soup when serving leftovers. The beans and pasta tend to soak up lots of broth.