01 -
Season the chuck roast evenly with salt and black pepper, then position it in a 7-litre slow cooker. Arrange the diced potatoes, sliced carrots, and onion around the beef.
02 -
Combine beef stock, Worcestershire sauce, minced garlic, garlic powder, onion powder, dried oregano, and dried thyme in a bowl. Pour this mixture evenly over the meat and vegetables.
03 -
Cover with the lid and cook on low for 7–8 hours or on high for 6–7 hours, until the roast is tender.
04 -
In a small bowl, whisk 2 tablespoons cornstarch with 2 tablespoons water to create a slurry.
05 -
Fifteen minutes before serving, stir the cornstarch slurry into the slow cooker. Add the sliced mushrooms, cover, and cook an additional 10–15 minutes, until the gravy thickens. Serve warm.