Season the chuck roast with steak seasoning, salt, and pepper.
Heat the vegetable oil in a large skillet or sauté-capable cooker. Brown the roast for about 2 minutes per side.
Transfer the roast to a 6-quart slow cooker. Add the diced onion and minced garlic, cover, and cook on low for 6 to 8 hours.
Remove the roast, shred it, discard excess fat, and return the beef to the slow cooker.
Whisk together the water, bouillon, and Worcestershire sauce, then pour it over the beef.
Stir in the egg noodles, cover, and cook on low for 30 to 60 minutes, stirring once or twice, until tender. Add a little extra water or broth if needed.
Stir in the optional heavy cream during the last 15 minutes, then serve.