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.

Notes
Add tomato, lettuce, and mayo for a “deluxe” version like Arby’s.
No Arby’s sauce? Use a spicy BBQ sauce instead.
Swap cheese sauce for shredded or sliced cheddar—it’ll melt from the heat.
Toast the rolls for added crunch.
Not a fan of onion rolls? Use any bun you like—even make sliders with dinner rolls!
Store leftovers covered in the fridge for up to 3 days.