Peel 6 apples and slice a small portion off of the bottoms so that they sit well without tumbling over. Place in a greased iron skillet or other heavy-bottomed skillet.
Stuff each apple with stuffing, filling the cavity and mounding it generously on top, pressing with the palm of a cupped hand to secure filling.
Pour ½ cup bourbon or apple juice, and 4 tablespoons butter around apples.
Place stuffed apples in preheated oven and bake for about 20 minutes or until apples are fork-tender. Remove from oven and carefully remove apples with a spatula to a serving platter.
For Sauce:
Heat remaining juices (adding more bourbon or apple juice if needed), and bring to a boil over medium-high heat. Add brown sugar and stir with a wooden spoon and reduce liquid until it reaches a syrup-consistency sauce (thick enough to coat the back of a spoon).