In a large pan, bring one tablespoon of olive oil to a steady temperature over medium heat.
Add the onion and bell pepper that have been diced. To soften, sauté for around three to four minutes.
If you are using mushrooms, add them to the pan and continue to cook them until they lose their moisture and become more pliable.
A mixture of salt and pepper should be applied to the steak slices before they are added to the pan. Cook for around three to four minutes, or until the food is browned and completely done.
After removing the skillet from the heat, let the mixture to cool down a little bit.
Bring together the egg rolls by:

A clean surface should be used to lay out an egg roll wrapper with one corner facing toward you in the form of a diamond.
Take a tablespoon of the steak mixture that has been cooked and place it in the middle of the wrapper.
A piece of provolone cheese or a tiny bit of it should be placed on top.
You should begin by folding the bottom corner over the filling, then fold in the sides, and then roll up the wrapper in a tight manner.
A little amount of the egg wash should be brushed over the upper corner of the egg roll in order to seal it. Wrappers and filling should be repeated with the remaining wrappers.
Egg Rolls should be fried:

In a deep skillet or saucepan, heat the oil to a temperature of 175 degrees Celsius (350 degrees Fahrenheit).
When the oil is heated, add the egg rolls in a slow and careful manner, a few at a time. For about three to four minutes on each side, fry until golden brown and crispy.
Take the item out of the oil and place it on paper towels to sit.
Provide:

To serve, bring to a boil and accompany with your preferred dipping sauce, such as sriracha mayonnaise or cheese sauce.
Delight in the deliciousness of your Philly Cheesesteak Egg Rolls!