Preheat your oven 350°F (180°C). Add 2 Tablespoons olive oil to your pan over medium-high heat.
Toss in your sliced 1 bell pepper and 1 large onion and saute until they begin to brown and caramelize, about 10 minutes.
Pour in the 1 Tablespoon worcestershire sauce and season with 1 Tablespoon salt, 1 Tablespoon black pepper, and 1 teaspoon Italian seasoning. Stir to combine everything together.
In the same pan, add the 1 pound shaved ribeye steak. Cook until it begins to break down.
Once the shaved steak has browned, add 4-6 American cheese slices (out of 8-10 slices American cheese; reserve the rest for the next step) and allow it to melt. Continue mixing everything together thoroughly.
Using a knife, carefully halve your 12 slider buns and line the inside of the tops and bottom buns with the remaining American cheese slices.
Use a spoon and carefully transfer all of the cheesesteak filling to the bottom half of the rolls. All of the meat should fit perfectly in your rolls. Add the top half of the buns back to the sliders.
Place the sliders back into the original cardboard packaging and wrap with aluminum foil.
Place the sliders in your preheated oven for 25 minutes. If you do not want to add 1 Tablespoon garlic butter, bake for 30 minutes.
Optional: For an even richer taste and crisper finish, brush the tops of the buns with homemade garlic butter after baking for 25 minutes. Pop them back in the oven for a remaining 5 minutes after.
Once done, remove from the oven and let them sit for 5 minutes. Carefully unwrap from the foil and slice into individual sandwiches. Enjoy!
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Notes
Season after the peppers and onions begin to caramelize for best results.
To prevent the meat from getting clumpy, use two forks to separate the shaved ribeye slides until it all falls apart.
Cover as much of the bread as you can with the cheese slices to prevent the sliders from getting soggy.
Hawaiian roll sliders cardboard packaging is safe up to 350°F in the oven, so you can bake these Philly steak sliders in the rolls packaging.
Wrap the sliders in aluminum foil twice to prevent any leaks in your oven.