Creating High Protein Low Carb Philly Cheesesteak Casserole is simple when you follow these easy steps:

1. Preheat your oven to 350°F (175°C).
2. Cook the beef: In a large skillet, heat 1 tablespoon of olive oil over medium-high heat. Add the beef and season with salt, pepper, onion powder, and garlic powder. Cook until browned, about 5 minutes. Remove the beef from the skillet and set aside.
3. Sauté the vegetables: In the same skillet, add the remaining tablespoon of olive oil. Sauté the onion and bell peppers until they are tender, about 5-7 minutes. Add the minced garlic and cook for an additional minute.
4. Combine ingredients: In a large mixing bowl, combine the cream cheese, Worcestershire sauce, and cooked beef. Stir until the mixture is smooth and well incorporated. Add the sautéed vegetables and mix until evenly combined.
5. Prepare the baking dish: Grease a 9×13 inch baking dish. Spread the beef and vegetable mixture evenly across the bottom of the dish.
6. Add cheese: Layer the shredded provolone and mozzarella cheese over the top of the casserole, distributing it evenly.
7. Bake: Place the casserole in the preheated oven and bake for 25-30 minutes, or until the cheese is melted and bubbly.
8. Cool briefly: Once baked, let it cool for about 5 minutes. This will help the casserole set a bit before serving.
9. Garnish: Sprinkle fresh chopped parsley on top for added flavor and color.

These steps will guide you seamlessly through preparing this incredible High Protein Low Carb Philly Cheesesteak Casserole.