Prepare your ribs by removing the membrane and patting dry with a paper towel.
Prepare the rub by combining brown sugar, paprika, garlic powder, onion powder, salt and pepper. Rub evenly on top of the ribs.
Cut the ribs in half. Add half of the rack of the ribs into the bottom of the slow cooker. Pour half of the sauce on top and layer with the other rack with remaining sauce. You can also wrap the ribs around the slow cooker if the top will fit on.
Cook the ribs on low for 6-7 hours or high for 3-4 hours.
Preheat oven to 425 degrees Fahrenheit. Remove the ribs and set on a baking sheet. Pour the sauce on the top. Cook for 10 minutes until the tops get crispy. Brush with additional sauce if needed.