01 -
Heat the butter in a large pot on medium. Toss in the onions, peppers, and mushrooms. Stir as they cook, letting the onions turn soft and clear.
02 -
Add the minced garlic and roast beef to the pot. Cook for a couple of minutes, just until the garlic smells amazing.
03 -
Toss some flour in and stir until blended. Keep it on the heat for about 3 minutes.
04 -
Slowly pour in the beef broth while you stir. Add in the half and half, Worcestershire, plus the salt and pepper.
05 -
Turn up the heat to get it boiling. Then, lower to a simmer for 10 minutes, giving it a stir here and there.
06 -
Combine water and cornstarch in a small bowl until smooth. Pour this into the soup, boil it again, and stir constantly for 3 minutes to thicken.
07 -
Take the pot off the heat. Stir in shredded provolone until smooth and creamy. Sprinkle extra cheese or parsley on top if you like!