Preheat oven to 375°F (190°C).
In a large bowl, combine the ground turkey, chopped vegetables, breadcrumbs, onion, garlic, egg, parsley, and thyme. Season with salt and pepper. Mix until just combined.
Form the mixture into a loaf shape and place on a baking sheet lined with parchment paper.
In a small bowl, whisk together the ketchup and balsamic vinegar to make the glaze. Brush the glaze over the meatloaf.
Bake for 45-55 minutes, or until the meatloaf is cooked through.
Let cool for a few minutes before slicing and serving.