Prepare the tortellini.
Prepare the tortellini following the instructions on the package until they are firm but tender. Drain the food and mix it with 1 tablespoon of olive oil to avoid it sticking. Put aside.
Make the cheesesteak mixture.
In a big frying pan, warm up 1 tablespoon of olive oil on medium-high heat.
Put the cut beef, onion, and green pepper. Cook while stirring often until the meat is brown and the vegetables are soft. Add salt and pepper. Put aside.
Prepare the provolone cheese sauce:
In a pot, melt butter on medium heat. Mix flour into the mixture to make a roux. Slowly pour in milk while stirring constantly to avoid clumps.
Keep cooking until the sauce becomes thicker. Lower the heat and mix in shredded provolone cheese until it melts and becomes smooth. Add salt and pepper to taste.
Mix and serve.
