Do yourself a favor and make these Crockpot BBQ ribs when you don't have time to fuss. They cook on low for eight hours and take just two minutes of prep in the morning, plus two minutes when they're almost done.
Spray a large slow cooker with cooking spray or use a slow cooker liner. Sprinkle the ribs with garlic powder. For an oval, 6-quart, Crockpot, cut the slab in half with kitchen scissors if needed to fit the ribs inside. (Lay them down if needed.) If you have a tall Crockpot, place the ribs standing up, with the meat side facing the walls of the cooker.
Cover and cook on low for eight hours. A half hour before they are ready (7 ½ hours into the process), transfer the ribs to a platter and drain the liquid from the pot into the sink.
Place the ribs back in the slow cooker and add the BBQ sauce. Cover and cook for the last 30 minutes on low.
Place the ribs on a platter (they will be falling off the bone). Serve with extra sauce from the slow cooker on the side. Store leftovers in the refrigerator for up to four days.
Notes
If you won't be home within 8 hours, the ribs can stay on warm for another three hours. Then drain them and add the sauce on low just until heated through.