Preheat your oven to 350F and place an oven-safe wire rack on top of a baking sheet. If you don't have a wire rack, you can instead cook the sliders directly on a baking sheet or dish, however the bottoms will get slightly more soggy.
Cut your steak against the grain as thinly as possible. If you don't have a sharp knife, you can freeze the steak for 30 minutes first to make it easier to slice. Then, sprinkle the seasonings evenly over the steak and toss to coat.
1-1.25 lbs boneless sirloin or ribeye, ½ tsp kosher salt, ¼ tsp smoked paprika, ¼ tsp garlic powder, ¼ tsp onion powder, ¼ tsp black pepper
Bring a large pan to medium-high heat. Once hot, add ½ tbsp of oil. Then, add half of the steak and spread out evenly so that there's no overlap. Allow it to cook, undisturbed for 1.5 minutes, then flip and continue cooking for another 1.5 minutes. Remove steak from pan, add another ½ tbsp of oil, and repeat with the remaining steak, transferring it all to a plate after cooking.
1.5 tbsp olive oil
Reduce heat to medium and add in remaining ½ tbsp of oil. Then added diced bell peppers and onion and season with kosher salt & black pepper. Sauté, stirring occasionally, for about 5 minutes, or until mostly tender. Add garlic and cook for 1 more minute, until fragrant.
1.5 tbsp olive oil, 1 small green bell pepper, 1 small red bell pepper, ½ large yellow onion, 3 garlic cloves, kosher salt & black pepper
Add cooked steak (and any juices from the plate) back to the pan along with Worcestershire sauce and red pepper flakes to taste. Stir to combine. Remove from heat.
1 tbsp worcestershire sauce, red pepper flakes
Add the bottom half of the Hawaiian rolls to the wire rack on the baking sheet. Then, add 4 slices of provolone cheese, followed by the steak and pepper mixture and the remaining 4 slices of cheese. Place the top half of the Hawaiian rolls on and then brush with butter and sprinkle with flaky salt (optional).
12 oz hawaiian rolls, 8 oz provolone cheese, ½ tbsp butter, flaky salt
Loosely tent the sliders with aluminum foil and transfer to the oven to bake for 10 minutes. Remove aluminum foil and continue cooking for 10 more minutes. Enjoy!