I swear my hubby begs me to make these for any party!

1 pound thinly sliced beef ribeye or sirloin
1 tablespoon olive oil
1 small onion, finely chopped
1 small green bell pepper, finely chopped
1 cup sliced mushrooms
1 cup shredded provolone cheese
8 egg roll wrappers
1 egg, beaten
Salt and pepper to taste
Cooking spray