Continue to cook and whisk until the sauce thickens, about 3-4 minutes.
Remove the saucepan from heat and stir in 1 cup of shredded provolone cheese until melted and smooth.
Return the cooked beef to the skillet with the onion and pepper. Pour the provolone sauce over the beef and vegetables. Stir to combine.
Add the cooked tortellini to the skillet and toss everything together until well coated with the sauce.
Serve hot and enjoy!