01 -
Heat a skillet over medium-high and cook the ground beef, breaking it up with a wooden spoon until no pink remains, about 5 to 7 minutes. Transfer the meat to a plate, keeping the drippings in the pan.
02 -
Thinly slice the onion and bell pepper, and finely mince the garlic to ensure even cooking.
03 -
Add butter to the skillet over medium heat. Once melted, add the onion, bell pepper, and garlic. Stir occasionally, cooking until vegetables soften and the onion becomes translucent, about 4 to 5 minutes.
04 -
In a bowl, whisk together ketchup, Worcestershire sauce, salt, black pepper, cornstarch, and beef broth until smooth and cornstarch is fully dissolved.
05 -
Pour the sauce into the skillet with vegetables and stir to coat. Return the cooked ground beef to the pan. Mix thoroughly and cook for 2 to 3 minutes until the sauce thickens and evenly coats the mixture.
06 -
Place the hoagie rolls cut side up under a broiler for about 1 minute, watching carefully to prevent burning.
07 -
Lay a slice of provolone cheese on the bottom half of each toasted roll. Spoon the beef and vegetable mixture evenly over the cheese, then top with another slice of provolone if desired.
08 -
Place the open-faced sandwiches under the broiler for 1 to 2 minutes until cheese is bubbly, melted, and lightly browned. Serve immediately while hot.