Heat olive oil in a skillet over medium heat. Once hot, add the thinly sliced seasoned beef and cook for about 5-7 minutes, or until it's browned and juicy.

Add the sliced bell peppers (and onions if using) to the skillet, seasoning with salt and pepper. Sauté for another 5 minutes, until the peppers are just tender and colorful.

Reduce the heat to low, sprinkle the provolone cheese on top of the beef and peppers, cover, and let it melt for 2-3 minutes.

Once melted, take off the lid and spoon the hearty beef and pepper mixture into bowls. Serve hot.