Preheat the oven to 350 degrees F. Line a baking sheet with foil or parchment paper and set aside. Gather your ingredients. Prep the aromatics: finely chop the onion, mince the garlic, separate the thyme leaves from the stem and give the parsley (remove the stems) a rough chop.
In a large mixing bowl, add the ground turkey, onion mixture and the rest of the meatloaf ingredients; beaten egg, parmesan cheese, bread crumbs, chopped parsley (if using) and mix gently with a fork until the ingredients are just combined.
Bake the meatloaf in the preheated 350 degree oven for 10 minutes. Remove the meatloaf from the oven and spread the glaze evenly on top and on all four sides. Continue baking for 35-45 minutes or until the internal temp reaches 165 degrees F.