Heat 1 tablespoon of olive oil in a large skillet over medium-high heat.
Add the sliced bell pepper and onion to the skillet. Cook for 5-7 minutes, stirring occasionally, until softened and starting to caramelize at the edges.
Add the minced garlic and cook for 1 minute until fragrant.
Push the vegetables to the side of the skillet and add the shaved beef. Season with onion powder, oregano, salt, and pepper. Cook for 3-4 minutes, breaking it apart as it cooks, until browned and cooked through.
Add the Worcestershire sauce and stir everything together until fully combined.
Lay the provolone slices over the top of the beef and vegetable mixture. Cover the skillet and cook for 1-2 minutes until the cheese is fully melted.
Serve over cooked rice and enjoy immediately.