In a bowl, mix together the ground turkey, breadcrumbs, milk, Worcestershire sauce, and season well with salt and pepper until fully combined (use more breadcrumbs to firm up the mixture if needed). Shape the mixture into bite-sized meatballs.
Heat the oil in a pot over medium heat. Sauté the carrots, onion, celery, and garlic for 5 to 6 minutes.
Stir in the tomatoes, broth, and thyme. Add in the meatballs, chickpeas, and beans; cover with a lid and bring to a simmer for 20 minutes. Taste and adjust the seasoning with salt and pepper as needed.
Add in the couscous, cover with a lid and simmer until the couscous is fully cooked.
Remove the thyme stems. Ladle the soup into a bowl so there is a balanced ratio of broth to the rest of the ingredients. Serve with bread. Garnish with parsley.