In a 4-quart saucepan heat the oil over medium heat. Saute the onions until translucent, about 3 minutes, then add the garlic and cook for 1 minute more. Add tomato paste, tomatoes, chipotles, oregano, rosemary, and salt. Bring all the ingredients to a low boil, reduce heat and cook for approximately 15 minutes, until liquid has evaporated slightly. Season with salt and pepper, to taste.
Preheat the broiler. Spray a baking sheet with cooking spray. Combine the turkey with all other ingredients in a large work bowl. Form into 2 1/2 -inch balls and place on a baking sheet. Broil for 10 minutes, or until browned and almost entirely cooked through.
Meanwhile, remove rosemary sprig from sauce and add fresh basil. Add the meatballs to the sauce, cover, and cook additional 10 minutes, or until sauce has slightly thickened and meatballs have absorbed some of the sauce.
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