Heat oil in a Dutch oven or a large soup pot with a thick bottom.
Add ground chicken, sprinkle with Italian seasoning, oregano and red pepper flakes (if using). Cook on medium, breaking up the meat until browned, 6-7 minutes.
Add carrots and onions, and cook together for 5 minutes stirring often. Towards the end, add minced garlic, stir and cook until fragrant, 1 extra minute or so.
To the chicken and veggies mixture add diced zucchini, summer squash, canned petite cut tomatoes and broth.
Bring to a boil, partially cover with a lid and cook the soup for 15 minutes on low.
Add ditalini pasta and cook until pasta is soft, 7 minutes or so.
Taste and season with salt and pepper.
Serve with freshly grated parmesan cheese and fresh parsley leaves.