Heat a large skillet over medium-high heat. Add ground beef and cook until browned, breaking it up with a spoon. Drain excess fat if desired and set meat aside.

In the same skillet, add olive oil, sliced onions, and chopped peppers. Sauté for 3-4 minutes until softening.

Add sliced mushrooms to the skillet and cook for another 3-4 minutes until tender and browned.

Return the cooked beef to the pan. Stir in Worcestershire sauce, garlic powder, onion powder, salt, and pepper. Cook for 2 minutes to meld flavors.

Flatten the mixture in the pan and layer provolone cheese slices on top.

Cover the skillet with a lid and reduce heat to low. Cook for 1-2 minutes until cheese is fully melted.

Serve immediately in bowls, garnished with parsley if desired.