In a very large, deep sauté pan, heat olive oil over medium heat. Once the oil is hot, add the turkey, onion, celery, and carrot. Season with salt and pepper and sauté (breaking up the turkey into small pieces) until turkey is cooked through and vegetables are softened.
Add red pepper flakes and garlic and sauté for another 1-2 minutes or until fragrant. Add in the crushed tomatoes, tomato paste, diced tomatoes, oregano, and brown sugar. Bring to a boil and then lower heat to medium low and simmer for 15 minutes.
Add basil and stir to combine. Taste for seasonings and add more sugar, salt, pepper as desired.
While the sauce is cooking, prepare the zucchini noodles using a spiralizer or other methods described in this post. After the sauce has cooked, toss in zucchini noodles using tongs and let cook for 3-4 minutes.
This recipe can easily be made Whole30 compliant by leaving out the teaspoon of brown sugar.