Prepare your workspace by preheating your oven to 375°F (190°C) and lining a baking sheet with parchment paper.
Sauté the aromatics by melting butter in a skillet over medium heat, then adding onions and celery. Cook for 5-7 minutes until softened but not browned. Let cool slightly.
Combine the base mixture in a large bowl by mixing the prepared stuffing, chopped turkey, and sautéed vegetables. If your stuffing is very dry, add a splash of broth to moisten.
Add the flavor enhancers by folding in the cranberries, fresh herbs, salt, and pepper, ensuring even distribution throughout the mixture.
Bind the mixture by pouring in the beaten eggs and gently mixing until everything holds together. The mixture should be moist but not soggy.
Form the balls using about 2 tablespoons of mixture for each. Roll between your palms to create golf ball-sized portions, placing them on the prepared baking sheet about an inch apart.
Brush with oil to ensure a golden, crispy exterior. Make sure to coat the tops and sides lightly.
Bake until golden for 25-30 minutes, rotating the pan halfway through for even browning. The stuffing balls should be crisp on the outside and reach an internal temperature of 165°F.
Rest briefly for 5 minutes before serving to allow them to set up properly.