Heat oil in large skillet over medium-high heat. Add carrots, celery, onions and kale. Cook 5 minutes, or until softened. Add ground turkey, salt, pepper and Italian seasoning, and cook 5-7 minutes or until turkey is cooked through. Add garlic and cook 1-2 minutes. Add quinoa and tomatoes. Stir to combine, reduce heat to low and let simmer 5 minutes.
Place pepper halves in baking dish and fill with turkey mixture. Cover loosely with foil and bake 30 minutes. Remove from oven, top peppers with cheese and bake 5 minutes, or until cheese melts.