Heat the olive oil in a large skillet over medium-high heat. Add the sliced onion and green bell pepper and saute for 4 to 5 minutes until they are soft and lightly caramelized.
Add the shaved ribeye steak and minced garlic to the skillet. Season with the salt, black pepper, and garlic powder. Cook, stirring and breaking the meat apart, for 4 to 5 minutes until the steak is fully cooked and no longer pink.Remove the skillet from the heat. Scatter the chopped provolone cheese over the hot meat and stir until it melts and gets gooey throughout the filling. Let the mixture cool for 5 minutes so it is easier to handle.
Lay an egg roll wrapper on a clean surface in a diamond shape. Place about 2 to 3 tablespoons of the cheesesteak filling in a line across the center. Fold the bottom corner up over the filling, fold the two side corners in tightly, then roll upward toward the top corner. Brush the top corner with a dab of water to seal the edge. Repeat with all remaining wrappers.
Preheat the air fryer to 390 degrees F for 3 minutes.
Lightly spray the egg rolls on all sides with cooking spray and place them seam-side down in the air fryer basket in a single layer. Do not stack them. Cook at 390 degrees F for 5 minutes.
Flip the egg rolls over and cook for another 3 to 4 minutes until they are deeply golden, crispy, and have a crunchy shell all around.
Let the cheesesteak egg rolls cool for 2 to 3 minutes before serving. They pair perfectly with a warm cheese dipping sauce or marinara.