1-Step 1: Prepare the Beef for Easy Slicing Place your sirloin steak in the freezer for 20 to 30 minutes before slicing. This brief chilling period firms up the meat, making it significantly easier to cut into thin, even slices. Partially frozen meat holds its shape better under the knife, allowing you to achieve those paper-thin pieces that are essential for an authentic texture. While the beef chills, you can prep your vegetables and gather your other ingredients.

2-Step 2: Cook the Peppers and Onions Heat 2 tablespoons of vegetable oil in a large, deep sauté pan over medium-low heat. Add the thinly sliced sweet yellow onion along with both the red and green bell peppers. Cook these vegetables slowly, stirring occasionally, until they become very tender without browning. This process typically takes 10 to 15 minutes and allows the natural sugars in the onions to develop a sweet, mellow flavor. The peppers should soften while maintaining just a hint of texture. Once perfectly tender, transfer the vegetables to a dish and set them aside.

3-Step 3: Slice and Prepare the Beef Remove the beef from the freezer and trim away any excess fat. Using a sharp knife, slice the meat as thinly as possible against the grain. Cutting against the grain shortens the muscle fibers, resulting in more tender bites. After slicing, chop the meat into very small pieces, roughly ¼-inch in size. This fine chop is what gives authentic philly cheesesteak peppers and onions their signature texture and allows the meat to cook quickly and evenly.

4-Step 4: Cook the Beef in Batches Add additional vegetable oil to the pan and increase the heat to medium-high. Working in batches is crucial here, as overcrowding the pan would steam the meat rather than sear it. Add half of the beef to the hot pan and season it with half of the seasoned salt and garlic pepper. Cook, stirring frequently, until the meat is browned and no pink remains. Transfer this batch to the dish with the vegetables using a slotted spoon, leaving the flavorful juices in the pan. Repeat the process with the remaining beef and seasoning.

5-Step 5: Prepare the Hoagie Rolls Preheat your oven to 400 degrees F. Split the hoagie rolls lengthwise without separating them completely, keeping them hinged. Spread the softened butter generously inside each roll and place them on a baking sheet, buttered side up. Toast in the oven for 3 to 5 minutes until lightly golden. This toasting step serves two purposes: it adds wonderful texture and creates a buttery barrier that prevents the bread from becoming soggy when you add the hot, juicy filling.

6-Step 6: Combine and Melt the Cheese Drain any excess juices from the pan, then return all the cooked beef and sautéed vegetables to the pan. Arrange the provolone cheese slices in an even layer over the top of the mixture. Cover the pan and cook over medium heat until the cheese melts completely, about 4 to 5 minutes. The steam trapped under the lid helps the cheese melt evenly and coat every piece of meat and vegetable.

7-Step 7: Assemble and Serve Using tongs, mix the melted cheese through the beef and vegetable mixture until everything is evenly coated and gooey. This thorough mixing ensures that every bite contains the perfect ratio of meat, peppers, onions, and cheese. Fill the toasted hoagie rolls generously with the hot mixture and serve immediately while the cheese is still melty and the rolls are warm and crisp.