01 - Preheat the oven to 375°F. Line a baking sheet with parchment paper or lightly grease a loaf pan.
02 - In a large bowl, gently mix ground turkey, eggs, onion, garlic, celery, carrot, breadcrumbs, milk, Worcestershire sauce, salt, pepper, and thyme until just combined.
03 - Form the mixture into a loaf shape on the baking sheet or press it into the loaf pan.
04 - Whisk together ketchup, brown sugar, apple cider vinegar, and Dijon mustard in a small bowl.
05 - Spread half of the ketchup glaze evenly over the top of the loaf.
06 - Bake the meatloaf for 40 minutes in the preheated oven.
07 - Remove from oven and spread the remaining glaze evenly over the loaf.
08 - Return to oven and bake an additional 15 minutes, or until the internal temperature reaches 165°F and the top is caramelized.
09 - Remove the meatloaf from the oven and let rest for 10 minutes before slicing.