Preheat oven to 275 degrees Fahrenheit. Line a baking sheet or roasting pan with aluminum foil.
In a small bowl, stir together the ingredients for the dry rub: paprika, salt, pepper, onion powder, garlic powder, and ground mustard. Rub this mixture generously over the outside of the ribs to coat. Place seasoned ribs in a single layer onto prepared baking sheet or roasting pan.
Cover pan with aluminum foil. Cook in the preheated 275F degree oven for 3 1/2 to 4 hours until ribs are tender.
Remove ribs from oven and remove aluminum foil. Brush barbecue sauce onto ribs.
Place the baking sheet or roasting pan back into the oven underneath the broil setting. Broil for 3-5 minutes until the barbecue sauce starts to bubble and caramelize.
Notes
Slow Cooker Instructions:
Prepare rub and coat ribs. Place in a 6-quart slow cooker, cover, and cook on low 7 to 8. Finish by transferring ribs to a foil-lined baking sheet and brushing with bbq sauce. Place under broiler setting to caramelize the sauce.