Salt the roast generously on all sides, and leave it on a plate at room temperature for 45 minutes
Combine the black pepper, garlic powder, and onion powder. Spread the mixture on all sides of the roast
Preheat a skillet over medium-high heat with oil. Sear the roast on both sides for 2-3 minutes each until golden brown
Combine beef broth, onion soup mix, and Worcestershire sauce in the slow cooker pot. Add the roast, spooning a few spoonfuls of the liquid over the top of the roast
Cook on high for 4-6 hours or low for 7-8 hours
Transfer the roast to a cutting board, and let it rest for 5-10 minutes before shredding or slicing it
If you’d like thicker liquid, add the cornstarch slurry to the slow cooker pot. Stir, and let sit for about five minutes until thickened