Preheat oven to 350°F (175°C) and line a baking sheet with foil paper.
Place the breadcrumbs in a small bowl. Pour the chicken broth over the breadcrumbs and allow them to soak until most of the liquid is absorbed, about 5-10 minutes.
Melt butter in a skillet over medium heat. Add onion, mushrooms, and carrots. Sauté until they are soft and lightly browned, about 5-7 minutes.
In a large bowl, combine the ground turkey, soaked breadcrumbs, sautéed vegetables, beaten eggs, chopped parsley, Worcestershire sauce, salt, celery salt, and black pepper. Mix everything together gently.
Transfer the mixture to the lined sheet pan, shaping it evenly into a loaf.
Bake in the preheated oven for about 40 minutes.
Make the glaze while the meatloaf is baking by combining ketchup, brown sugar, apple cider vinegar, Worcestershire sauce, garlic powder, and black pepper in a small bowl. Stir well until all the ingredients are fully mixed.
Remove the meatloaf from the oven after 40 minutes. Spread the glaze evenly over the top.
Return the meatloaf to the oven and continue baking for 20 minutes, until the meatloaf’s internal temperature reaches 165°F (74°C).
Remove from oven and allow the meatloaf to cool 10-15 minutes before slicing and serving.