Preheat your oven to 300°F (150°C).
Remove the thin membrane from the back of the ribs.
Mix brown sugar, paprika, garlic powder, onion powder, salt, and black pepper in a bowl.
Rub the spice mix all over the ribs.
Wrap the ribs tightly in aluminum foil and place them on a baking sheet.
Bake in the preheated oven for 2.5 hours.
Remove the ribs from the oven and unwrap them.
Brush the ribs with BBQ sauce and return to the oven, uncovered, for another 30 minutes.
Let the ribs rest for 10 minutes before serving.