In a large skillet over medium heat, add 1 tablespoon of olive oil. Once hot, add the sliced onion and green bell pepper. Sauté for about 5 minutes until they begin to soften. Add the garlic and sauté for an additional minute. Remove the veggies from the skillet and set aside.
In the same skillet, add the remaining tablespoon of olive oil and ground beef. Cook until browned, breaking it apart as it cooks, about 6-8 minutes. Drain any excess grease.
Stir in the thinly sliced ribeye, Worcestershire sauce, Italian seasoning, salt, and pepper. Cook for another 2-3 minutes until the beef is just cooked through and no longer pink.
Add the sautéed veggies and mushrooms to the beef mixture, stirring well to combine.
Reduce the heat to low and mix in the cream cheese until melted and well combined, creating a creamy texture throughout.
Transfer the mixture to a greased 9x13 inch baking dish.
Top the casserole with shredded provolone and mozzarella cheese evenly over the mixture.
Bake in the preheated oven for about 20 minutes, or until the cheese is bubbly and golden brown.
Remove from the oven and let it cool for a few minutes before serving.
Notes
Serve hot, garnished with fresh parsley and a side of cauliflower rice for a complete meal.