Add the onions, salt, and pepper and cook until soft, about 10 minutes. Add the worcestershire sauce, chicken stock and tomato paste and mix well. Allow to cool to room temperature.
Combine the turkey, bread crumbs, eggs and onion mixture in a large bowl. Mix well.
Oil a muffin pan and fill each cup with mixture. Spread about 1 tablespoon of ketchup evenly on top. Bake for 45 minutes or until cooked through.
Recipe by Three Hungry Boys at https://www.threehungryboys.com/2015/11/17/turkey-meatloaf-muffins/