Get all the ingredients together.
Remove the ribs from the refrigerator 30 minutes before preparing them for the oven. Trim any excess fat and remove the membrane that covers the bones. Preheat the oven to 300°F.
In a small mixing bowl, whisk together the sugar, garlic powder, paprika, smoked salt, and cayenne pepper. Rub the spice mixture all over both sides of the ribs.
Lay out 2 layers of aluminum foil, dull side up, long enough for the ribs to fit inside. Place the ribs, meat side down on the foil. Place 2 more sheets of foil, shiny side facing up, on top of the ribs. Roll and crimp all the edges of the foil to form a tight seal around the ribs.
Place the foil packet of ribs on a sheet pan. Place the sheet pan in the oven and bake for 2 to 2-1/2 hours until the meat starts to pull away from the bone ends. You can take a peek at 2 hours being careful not to let all the juices run out onto the pan.
Remove the pan from the oven and place the ribs on a clean cutting board. Cut the ribs into portions – 2 or 3 ribs per portion.
Turn on the broiler. Place the ribs on a broiler pan, bone side facing up. Slather on 1 cup of the barbeque sauce. Place the ribs under the broiler and cook until the sauce is bubbling and sticky, approximately 1-1/2 minutes. Be careful not to burn them!
Remove the pan from the oven. Flip the ribs over and slather on the rest of the sauce. Return the pan to the oven and broil again for approximately 1-1/2 minutes.
Serve the warm rib portions with extra sauce and your favorite barbeque sides and a bunch of paper napkins. The ribs will pull apart from one another.