Prep: Preheat the oven to 350 degrees F and prepare your baking sheet.
Prepare the stuffing: Measure out the stuffing breadcrumbs and prepare according to package instructions.
Cook the aromatics for the meatballs: Sauté the onion, garlic, celery, and herbs.
Mix the meatballs: Combine the breadcrumb mixture with turkey and seasonings.
Form and stuff the turkey meatballs: Create meatballs around reserved stuffing.
Par-bake the Thanksgiving meatballs: Bake in the oven for a short time.
Brown the Thanksgiving meatballs: Sauté the par-baked meatballs until golden.
Prepare the gravy: Create a base using the remaining ingredients.
Serve: Ladle the meatballs with gravy over your favorite side.