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, diced onion, grated carrot, diced celery, minced garlic, oats or breadcrumbs, beaten 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 turkey mixture evenly among the 12 muffin cups, pressing lightly to fill each cavity and smoothing the tops.
04 - Spoon or brush a thin layer 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 and golden.
06 - Let the muffins rest in the pan for 5 minutes before carefully removing. Serve warm with your choice of sides.