Preheat oven to 275°F (135°C). Line a large baking sheet or roasting pan with aluminum foil.
Remove the membrane from the back of the ribs by sliding your fingers under it to loosen, then pull it off. Use a paper towel for a better grip if it feels slippery.
In a small bowl, mix together 1 tablespoon smoked paprika, 1 teaspoon salt, 1 teaspoon black pepper, 1 teaspoon onion powder, 1 teaspoon garlic powder, and 1 teaspoon ground mustard.
Rub the dry spice mixture generously over both sides of the ribs, ensuring an even coating. Place the seasoned ribs in a single layer on the prepared baking sheet or roasting pan.
Cover the pan tightly with aluminum foil and place it in the oven. Bake for 3 1/2 to 4 hours, or until the ribs are tender and the meat is starting to pull away from the bones.
Remove the ribs from the oven and discard the top layer of foil. Brush a generous layer of barbecue sauce over the ribs.
Turn the oven to broil. Place the ribs back into the oven under the broiler for 3-5 minutes, or until the sauce bubbles and caramelizes. Watch carefully to prevent burning.