Preheat your oven to 300°F (150°C).
Remove the thin membrane from the back of the ribs and pat the meat dry with paper towels.
In a small bowl, combine the smoked paprika, garlic powder, onion powder, sea salt, and black pepper.
Rub the spice mixture evenly over both sides of the ribs.
Wrap the ribs tightly in a double layer of aluminum foil and place them on a baking sheet. Bake for 2 hours until the meat is tender and pulling away from the bone.
While the ribs bake, whisk together the tomato paste, maple syrup, apple cider vinegar, and apple sauce in a small saucepan over low heat for 5 minutes to create the glaze.
Toss the sliced bell peppers with olive oil and a pinch of salt. Roast them on a separate tray at 400°F during the last 15 minutes of the ribs' cooking time.
Carefully unwrap the ribs, brush them generously with the prepared BBQ glaze, and broil on high for 3-5 minutes until the sauce is bubbling and slightly charred.
Let the ribs rest for 5 minutes before slicing and serving alongside the roasted peppers.