Making Ground Beef Philly Cheesesteaks is a straightforward process. Follow these steps to create your delicious sandwiches:

1. Heat the Olive Oil: In a large skillet over medium heat, add the olive oil and let it heat for a minute.
2. Cook the Vegetables: Add the sliced onion and green bell pepper to the skillet. Sauté for 3-5 minutes until softened. Remove them from the skillet and set aside.
3. Brown the Ground Beef: In the same skillet, add the ground beef. Cook until browned, breaking it apart with a spatula, about 5-7 minutes.
4. Season the Beef: Once the beef is cooked, drain any excess fat. Stir in garlic powder, onion powder, salt, and black pepper. Mix well.
5. Combine Ingredients: Add the cooked onions and bell peppers back to the skillet with the beef. Stir to combine and heat through for another 2 minutes.
6. Melt the Cheese: Place the slices of cheese on top of the beef mixture. Cover the skillet for a minute or until the cheese has melted.
7. Prepare the Rolls: While the cheese melts, slice the hoagie rolls open without cutting all the way through.
8. Assemble the Sandwiches: Spoon the beef and cheese mixture into each hoagie roll.
9. Optional Step: If desired, toast the assembled sandwiches in the skillet for an additional 1-2 minutes for a crispy exterior.
10. Serve: Remove from the skillet and serve immediately while hot.