Add the roast to the bottom of a 6 quart slow cooker.
Sprinkle the dried onion and steak seasoning evenly over the roast.
Pour the Worcestershire sauce over the top.
Pour the 1 ½ cups Arby's sauce evenly on the roast.
Cover and cook on LOW for 8 hours or HIGH for 4 hours.
After the cook time is up and the roast is tender, use two forks to shred the meat. Stir it into the sauce and turn the slow cooker to WARM for serving.
Heat the cheddar cheese sauce in the microwave for serving.
Pile the shredded beef onto onion rolls and top with cheddar cheese sauce and more Arby's sauce.
