Add the chuck roast to the slow cooker. Add the carrots, potatoes, and onion.
Sprinkle over the onion soup mix. Add the cream of mushroom soup, you can smear it over the top of the roast and vegetables. Don't worry about it being perfect, it will all cook down together.
Pour over the Worcestershire sauce and cola.
Cook on LOW for 9 hours without opening the lid during the cooking time.
You can remove the beef onto a plate. Shred with two forks and discard any fat.
Degrease the gravy with paper towels. Add the roast back to the slow cooker.
Serve and enjoy!
Video
Notes
You can use dr. pepper or root beer for this recipe. If you choose diet soda, the flavor will be altered.