Heat oil in a large skillet over medium-high heat. Rub the steak seasoning all over the roast.
Sear the roast on all sides until browned, about 4-5 minutes per side.
In a large Crockpot, whisk together beef broth, Worcestershire sauce, tamari or soy sauce, herbs de Provence or Italian seasoning, garlic powder, onion powder, and dried rosemary.
Submerge the roast into the liquid. Cover and cook on low for 7-9 hours, or until the beef is very tender and easily shreddable. Low temperature yields the most tender results If necessary, cook on high 4-6 hours.
Carefully transfer the beef to a cutting board. Shred with two forks.
Mix cornstarch with 3 tablespoons of water to create a slurry. Whisk the cornstarch slurry into the slow cooker. Add back the shredded beef. Cook on high until thickened, about 10 minutes.
Use the shredded beef for sandwiches, tacos, or serve over rice, noodles, or mashed potatoes.