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