Preheat oven to 375° and spray a 7x11 baking dish with spray. Set aside.
In a large bowl, with clean hands, mix ground turkey, fried onions, mozzarella cheese, carrots, celery leaves, parsley, seasonings, bread crumbs, eggs and milk together.
Add turkey to baking dish and form into an oblong loaf.
Brush with barbecue sauce, cover with foil and bake in the oven for 1 hour.
Remove foil, top with additional barbecue sauce and bake uncovered for 15 more minutes.
Remove from oven, let sit for 10 minutes to rest. Slice into desired slices and enjoy.