Heat a large pot to medium-high heat with 1 tablespoon olive oil. Add the ground turkey, Italian seasoning, and red pepper flakes to the pan. Cook for about 10 minutes or until the turkey is brown.
Add onion, carrots, celery, and garlic to the pan and saute for 2 minutes. Then add the rest of the seasonings to mix and saute for another 5 minutes.
Add tomato sauce, tomato paste, chicken broth, water, potatoes, and cauliflower rice to the pot. Bring the soup to a boil and let it simmer for about 25 minutes or until the potatoes are fork-tender.