In a small mixing bowl, mix together the dry rub ingredients and set aside. Coat the inside of the slow cooker with nonstick cooking spray.
2 Tablespoons brown sugar, 1 Tablespoon smoked paprika, 2 teaspoons onion powder, 2 teaspoons garlic powder, 2 teaspoons kosher salt, ½ teaspoon black pepper, Nonstick cooking spray
Remove the membrane from the ribs (if not done already) and pat dry with a paper towel. Coat the outsides with the dry rub mixture.
3-4 pounds baby back pork ribs
Add the ribs to the inside of the slow cooker; it may be necessary to cut into a couple of pieces so that they will fit. Pour all but ½ cup of the barbecue sauce over the ribs. Cover with the lid and cook until the meat is tender, 6 to 7 hours on low, or 3 to 4 hours on high.
3 cups barbecue sauce, divided
When the ribs are almost done, preheat the oven to 425℉. Line a baking sheet with aluminum foil.
When the ribs are done cooking in the slow cooker, remove and place on the foil lined baking sheet. Using a pastry brush, coat with the remaining ½ cup of barbeque sauce.
Bake for 8 to 10 minutes until the outside starts to caramelize. Remove from the oven and serve.