Step 1: Brown the Beef
Heat olive oil in a skillet over medium-high heat. Sear the chuck roast for 3 to 4 minutes per side until browned.
Step 2: Prepare the Slow Cooker
Place sliced onions and mushrooms into the bottom of the slow cooker.
Step 3: Add Ingredients
Place the roast on top of the vegetables. Add garlic, beef broth, Worcestershire sauce, onion soup mix, salt, and pepper.
Step 4: Slow Cook
Cook on LOW for 8 to 9 hours or HIGH for 5 to 6 hours until the beef becomes tender and easy to shred.
Step 5: Serve
Spoon the rich onion mushroom gravy over the beef. Garnish with parsley and serve warm