Season the chuck roast generously with salt and pepper, then place it in the bottom of the crockpot.
Layer the diced potatoes, sliced carrots, and diced onion around the roast.
In a mixing bowl, combine the beef stock, Worcestershire sauce, minced garlic, garlic powder, onion powder, oregano, and thyme. Pour this mixture over the roast and vegetables.
Cover the crockpot and cook on low for 7-8 hours or on high for 6-7 hours.
If desired, mix cornstarch with water to make a slurry and stir it in during the last 30 minutes to thicken the gravy. Add sliced mushrooms in the last 10-15 minutes of cooking.
Once done, serve warm with gravy poured over the top.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3-4 days.