Preheat your oven to 375°F and lightly grease a 9x13 inch baking dish.
In a large skillet, heat olive oil over medium-high heat. Add the ground beef and cook until browned, breaking it apart with a spoon. Drain any excess grease.
Add the diced peppers and onions to the skillet. Sauté for 5–7 minutes until the vegetables are tender-crisp.
Reduce heat to medium-low. Stir in the softened cream cheese, Worcestershire sauce, garlic powder, salt, and pepper until the mixture is creamy and well-combined.
Transfer the beef mixture to the prepared baking dish and spread it into an even layer.
Lay the provolone slices across the top, then sprinkle the shredded mozzarella over the gaps.
Bake for 15–20 minutes, or until the cheese is melted and bubbly.
Optional: Broil for 1–2 minutes to brown the cheese.
Let sit for 5 minutes before serving. Garnish with fresh parsley if desired.