Prepare the Steak. Thinly slice the ribeye steak while it’s slightly frozen for easier cutting. Season the slices with salt and pepper.
Preheat the Blackstone Griddle. Heat your Blackstone griddle to medium-high heat. Add a drizzle of oil and let it heat up.
Cook the Onions and Peppers. Add the sliced onions and bell peppers to the griddle. Sauté until softened and caramelized, about 5-7 minutes. Push them to one side.
Sear the Steak. Add the seasoned steak slices to the griddle. Cook for 2-3 minutes on each side, breaking it apart with a spatula as it cooks. Combine the cooked steak with the veggies.
Add the Cheese. Place slices of cheese over the steak and veggies. Cover with a griddle dome or large lid for 1-2 minutes to melt the cheese.
Toast the Hoagie Rolls. Butter the inside of the hoagie rolls and place them on the griddle. Toast until golden and crispy.
Assemble. Scoop the cheesy steak and veggie mixture onto the toasted hoagie rolls. Serve immediately and enjoy!