Creating this Cheesy Low Carb Philly Cheesesteak Casserole is easy with clear, concise instructions. Follow these steps to ensure a successful dish:

1. Preheat the Oven: Begin by preheating your oven to 350°F (175°C).
2. Sauté the Vegetables: In a large skillet, heat olive oil over medium heat. Add the sliced onion and bell peppers, sautéing until they become soft, about 5–7 minutes.
3. Cook the Steak: Add the thinly sliced flank steak and cook until browned, approximately 5 minutes.
4. Add Garlic and Seasoning: Stir in minced garlic, Worcestershire sauce, salt, and black pepper. Continue to cook until the garlic is fragrant, about 2 minutes.
5. Combine Cream and Cheese: In a separate bowl, combine the heavy cream, mozzarella cheese, and half of the provolone cheese, mixing well.
6. Combine Ingredients: Pour the cheese mixture into the skillet with the steak and vegetables. Stir until everything is thoroughly combined and heated through.
7. Transfer to Baking Dish: Pour the casserole mixture into a greased baking dish, spreading evenly.
8. Top with Remaining Cheese: Sprinkle the remaining provolone cheese evenly over the top of the casserole.
9. Bake: Place the baking dish in the oven and bake for 25–30 minutes, or until the cheese is bubbly and golden brown.
10. Garnish and Serve: Remove from the oven and let it cool slightly. Garnish with chopped parsley before serving.

By following these straightforward steps, you can create a delicious Cheesy Low Carb Philly Cheesesteak Casserole that’s sure to impress.