Heat olive oil in a skillet over medium-high heat. Cook ground beef until browned. Drain excess fat.

Ensure the beef is thoroughly browned for best flavor.📌

Add onions, green bell pepper, yellow bell pepper, and garlic to the skillet. Cook until the vegetables are softened.

Sautéing vegetables until tender brings out their natural sweetness.📌

Stir in ketchup, Worcestershire sauce, and beef broth. Simmer for 5 minutes to allow flavors to meld.

Allowing the mixture to simmer helps deepen the flavors of the sauce.📌

Mix cornstarch with water to create a slurry. Stir the cornstarch slurry into the simmering mixture and cook until the sauce thickens to your desired consistency.

Mix cornstarch with cold water before adding to prevent lumps.📌

Spoon the beef mixture onto the sandwich buns. Top each with provolone cheese slices and let them melt, either by placing a lid on the skillet or briefly under a broiler.

For perfectly melted cheese, you can cover the skillet for a minute or two.📌