Season the thighs the night before smoking. I used a mortar and pestle to grind the salt, pepper, garlic powder, and fresh thyme together, but chopping the thyme finely should suffice. After seasoning, place the thighs in a covered container in the refrigerator overnight.
Smoke the following day at 300 degrees for about 60 to 90 minutes, until the internal temperature reaches 160 degrees. While the thighs are smoking, preheat an oven to 225 degrees.
Place the smoked thighs in an oven-ready container. The tighter they fit into the pan and the more evenly the thighs are laid out, the less fat you’ll need to cover them. If there’s a lot of empty space in the pan once you’ve laid out the thighs, choose a smaller pan. Now pour on the fat, and make sure the meat is completely covered. Cover the pan tightly and place into a 225-degree oven (or let them ride next to your briskets in the smoker) for the next 5 hours.
You can chill them for use the following day, or finish the preparation now for immediate consumption. To crisp the skin, place the thighs skin side up under a broiler, or skin side down in a hot cast-iron pan or on a hot grill. Watch them carefully, and be sure not to burn the skin. This should take no more than 5 minutes if they were still warm, or 10 minutes if they’ve been chilled. Enjoy.