Preheat the Oven
Preheat your oven to 375°F (190°C). Grease a loaf pan or line a baking sheet with parchment paper if shaping the meatloaf by hand.
Prepare the Meatloaf Mixture
In a large mixing bowl, combine the ground turkey, breadcrumbs, diced onion, minced garlic, egg, milk, Worcestershire sauce, ketchup, thyme, parsley, salt, and pepper. Mix until just combined; avoid overmixing, as this can make the meatloaf dense.
Shape the Meatloaf
Place the turkey mixture into the prepared loaf pan, pressing it down evenly, or shape it into a loaf on the parchment-lined baking sheet.
Make the Glaze
In a small bowl, whisk together the ketchup, brown sugar, Dijon mustard, and apple cider vinegar. Spread half of the glaze over the top of the meatloaf.
Bake the Meatloaf
Bake for 45 minutes, then remove from the oven and spread the remaining glaze on top. Return to the oven and bake for an additional 15 minutes, or until the internal temperature reaches 165°F (74°C).
Serve
Let the meatloaf rest for 5-10 minutes before slicing. Serve warm with mashed potatoes, steamed veggies, or a side salad.