Follow these simple steps to create your Philly Cheesesteak Casserole:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).

2. Cook the Beef: In a large skillet, brown the ground beef over medium heat until fully cooked. Drain excess fat.

3. Sauté Vegetables: Add the diced onion and bell pepper to the skillet. Sauté until the vegetables are tender, about 5 minutes.

4. Mix Ingredients: In a large bowl, combine the cooked pasta, beef mixture, beef broth, Worcestershire sauce, garlic powder, onion powder, salt, and pepper. Mix well.

5. Layer the Casserole: Pour half of the mixture into a greased 9×13-inch baking dish. Sprinkle half of the provolone cheese on top. Add the remaining beef mixture, then top with the remaining provolone and mozzarella cheese.

6. Bake: Cover the baking dish with aluminum foil and bake in the preheated oven for 20 minutes. Remove the foil and bake for an additional 10-15 minutes, or until the cheese is melted and bubbly.

7. Garnish: Once baked, remove from the oven and let it cool for a few minutes. Garnish with fresh parsley, if desired.

8. Serve: Cut into squares and serve warm.

These easy steps will guide you in creating an incredible Philly Cheesesteak Casserole that everyone will love!