01 - Preheat the oven to 375°F. Lightly grease a 12-cup muffin tin or line with paper liners.
02 - In a large mixing bowl, combine the ground turkey, onion, carrot, celery, garlic, oats or breadcrumbs, egg, milk, ketchup, Worcestershire sauce, Italian seasoning, salt, and pepper. Mix gently until just combined, being careful not to overwork the meat.
03 - Divide the mixture evenly among the prepared muffin cups, pressing lightly to fill each cavity.
04 - Spoon or brush a small amount of ketchup over the top of each muffin for a glazed finish.
05 - Bake for 22 to 25 minutes until the meatloaf muffins are cooked through and the tops are lightly glazed.
06 - Let the muffins rest in the pan for 5 minutes before removing. Serve warm with your choice of side.