Brown the Beef: In a large skillet over medium heat, cook the ground beef until browned, breaking it up as it cooks. Drain excess fat.
Add Aromatics: Stir in the onion and garlic. Cook until softened, about 3 minutes.
Season the Meat: Sprinkle in the ranch seasoning and au jus mix. Stir well.
Sauce It Up: Add pepperoncini, beef broth, ketchup, and Worcestershire sauce. Simmer for 10-15 minutes until thickened.
Toast & Assemble: Toast the buns and pile the meat mixture on top. Add cheese and extra pepperoncini if desired.
Serve & Enjoy: Serve hot with your favorite sides like coleslaw, potato chips, or a crisp green salad.