Spray a baking sheet or casserole dish with nonstick baking spray, and wrap the baking sheet or casserole dish in heavy-duty aluminum foil.
Pat the ribs dry with paper towels. In a small bowl, mix together the brown sugar, chili powder, smoked paprika, cumin, onion powder, garlic powder, and freshly ground black pepper. Rub it on both sides of the ribs, place them in the prepared dish, and let them sit for about 40 minutes.
Cover the ribs tightly with aluminum foil and bake at 275 degrees for about 2-2 1/2 hours or until fork tender. Carefully uncover the dish and drain any juices. Baste with homemade BBQ sauce or your favorite store brand. Bake uncovered for an additional 30 minutes or until they are fall-apart tender.
If desired, put them under the broiler for a couple of minutes but keep a close eye on them as I have always found broilers unpredictable.
