Add ground turkey, breadcrumbs, minced onion, garlic, carrots, spinach, Mozzarella cheese, ketchup, parsley, eggs, Worcestershire sauce, salt, and pepper into a large bowl.
Mix until everything is fully incorporated. (Sometimes clean hands work best for this step.)
Place in a loaf pan that has been sprayed with nonstick cooking spray, or line a sheet pan with parchment paper or aluminum foil and pour meat on the prepared pan then use your hands to form into a loaf shape, trying to keep it level so it cooks evenly.
Bake for 30 minutes.
While baking, mix glaze ingredients together. Remove meatloaf from oven and brush glaze over top.
Place back in the oven for another 30 minutes, or until internal temperature reaches 165 degrees F.
Remove and let cool for 10 minutes before serving. Sprinkle with chopped parsley to garnish if desired.
*You could use ground beef instead of ground turkey. It would be an easy switch. The ingredients, cooking time, temperature and everything else would be the exact same.