Season the Roast: Generously season the beef chuck roast with salt and pepper on all sides.
Layer Ingredients: Place the roast in a slow cooker or large pot. Add carrots, potatoes, onion, and garlic around it.
Add Liquid: Pour beef broth, Worcestershire sauce, and stout (or dark ale) over the roast and vegetables.
Season: Sprinkle with thyme and add pickled mushrooms (or pepperoncini).
Cook: Cover and cook on low for 8-10 hours (or on high for 4-5 hours) until the meat is tender and easily pulls apart.
Serve: Ladle portions into bowls and serve with crusty bread for dipping.
Enjoy the hearty flavors of this slow-cooked feast!