Preheat oven to 400°F and place rack in middle position. Prepare a 9x5” loaf pan by spraying the bottom and sides with nonstick spray.
In a 10-inch nonstick skillet, add the oil and heat over medium heat. Add the diced onions and cook until translucent (but not browned), about 5 minutes. Stir in the garlic, thyme, and oregano and continue cooking until fragrant, about 1 minute. Remove from heat and set aside to cool slightly, about 5-6 minutes.
While the onions are cooling, whisk together the eggs, milk, breadcrumbs, parsley, Parmesan, Worcestershire, Dijon, salt, and pepper until evenly mixed and it looks like a thick paste. Fold in the ground turkey and top with the onion mixture. Using your hands, mix well.
Place your mixture into your prepared loaf pan and spread and press evenly into the corners.
To make the glaze, stir all the ingredients together in a small bowl, then brush half over the top of the meatloaf.
Place it in the oven and cook for 20 minutes. Remove from the oven and brush the final half of the glaze on top, then return to the oven and continue cooking until an inserted digital thermometer registers 160°F, an additional 10-12 minutes.
Remove from the oven and let cool for 5 minutes before slicing and serving.