Cut off one slice of ham and cut it into small dice.
Turn up the grill temperature to 375*.
In a medium cast iron skillet, saute the ham pieces in butter until just browned.
Scoop out the ham and set aside.
To the remaining butter in the pan, add the sliced Brussels sprouts.
Season with salt and pepper and cook on medium-high heat for about 10 minutes, stirring occasionally.
Allow the sprouts to begin charring on all sides.
Add the crushed garlic clove and the Garlic Junkie seasoning.
Stir to combine and then pour in the heavy cream.
Bring the cream to a boil, stirring constantly.
Add the reserved ham pieces and stir to combine.
Remove the pan from the heat and sprinkle the top with mozzarella cheese and then cover generously with parmesan cheese.
Place the pan in the hot Traeger and cook for 15 minutes until hot and bubbly and the sprouts are fork tender.
Remove the pan from the grill and allow to cool for a few minutes while you slice the ham.
Serve the Brussels sprouts gratin alongside the orange and bourbon smoked ham.