Preheat oven to 350. Line a baking dish with aluminum foil. And lightly spray with cooking spray. Set aside. In a small bowl mix brown sugar, onion powder, garlic powder, salt, and pepper. This will create your dry rub. Coat ribs with the the dry rub, making sure to flip over and get both sides.Place coated ribs into the baking dish and into the oven. Bake for 45 minutes.Carefully slide your oven rack out a little so you can easily work with the baking dish. Coat ribs with half of the BBQ sauce. Flip ribs over. Return to oven and bake for an additional 30 minutes.Remove from oven and test temperature to make sure it is at 165-170. Allow ribs to sit in dish for 10 minutes. Slice ribs, most boneless ribs have cut grooves so you will just need to follow them.et aside. In a small bowl mix brown sugar, onion powder, garlic powder, salt, and pepper. This will create your dry rub. Coat ribs with the the dry rub, making sure to flip over and get both sides. Place coated ribs into the baking dish and into the oven.