Preheat oven or smoker to 225°F (107°C).
Pat ribs dry and remove any excess membrane if needed.
Mix salt, pepper, garlic powder, paprika, and brown sugar to create a dry rub.
Rub seasoning evenly over all sides of the ribs.
Place ribs on a baking tray or grill rack bone-side down.
Cook low and slow for 5–6 hours, spritzing with apple juice every hour.
During the last 30 minutes, brush ribs with BBQ sauce (optional).
Ribs are ready when internal temperature reaches 203–205°F and meat pulls away from the bone.
Rest for 10 minutes before serving.