Creating delicious skirt steak sandwiches can be a breeze if you follow these simple steps:

1. Prep the Steak: Season the skirt steak with olive oil, salt, and pepper. Allow it to rest for about 10 minutes.
2. Cook the Steak: Preheat a large skillet or grill pan over medium-high heat. Cook the skirt steak for 3-4 minutes on each side for medium-rare, adjusting the time to achieve your desired doneness.
3. Sauté the Vegetables: In the same pan, add sliced onions and peppers. Cook for about 5-7 minutes or until they are soft and slightly caramelized.
4. Rest the Steak: Remove the skirt steak from the pan and let it rest for 5 minutes before slicing. This helps maintain the juiciness of the meat.
5. Slice the Steak: Cut the steak against the grain into thin slices to ensure tenderness.
6. Assemble the Sandwiches: On the bottom half of each sandwich roll, layer the skirt steak slices, sautéed onions, and peppers. Top with shredded cheese.
7. Melt the Cheese: If desired, place the assembled sandwiches in a preheated oven at 350°F (175°C) for a few minutes until the cheese is melted.
8. Add Extra Toppings: Include any additional toppings such as lettuce, tomatoes, or pickles.
9. Serve: Place the top half of the sandwich on and cut it in half as needed. Serve immediately with your favorite sides.

These step-by-step instructions will guide you in creating irresistible skirt steak sandwiches that are sure to please everyone.