01 - Preheat the oven to 400°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, and garlic.
03 - Add the milk, egg, tomato paste, Worcestershire sauce, breadcrumbs, Italian herbs, salt, and pepper. Gently mix until just combined—do not overwork the mixture.
04 - Evenly divide the mixture among the prepared muffin tin cups, pressing gently to pack each one.
05 - Spoon a small dollop of ketchup onto the top of each muffin, spreading lightly.
06 - Bake for 22–25 minutes, or until the internal temperature reaches 165°F and the muffins are lightly browned on top.
07 - Allow the muffins to cool in the tin for 5 minutes before removing. Serve warm.