Begin by heating a sauté pan over medium heat. Add the ground beef, sprinkle with salt and pepper, and cook for about 5 minutes, breaking it up into crumbles as it browns. Once cooked through, transfer it to a plate and set aside. This ensures juicy beef without excess moisture in the final dish.

Using the same pan, melt a little butter and toss in the diced onion and bell pepper. Cook them for 4-5 minutes, stirring occasionally, until they soften and develop some caramelized edges. This step enhances their natural sweetness, adding depth to the dish.

Turn the heat to low and return the cooked beef to the pan. Stir in Worcestershire sauce, beef broth, and garlic powder. Allow the mixture to simmer gently for a few minutes, so the flavors meld beautifully. If the sauce looks too thin, dissolve a bit more cornstarch in water and stir it in to thicken.

Spread the mixture evenly in the pan and lay the slices of cheese on top. Cover the pan with a lid and allow the cheese to melt for 1-2 minutes. It’ll blend right into the beef mix, making every bite creamy and irresistible.

Toast your buns lightly for extra texture. Spoon the cheesy filling onto the buns, packing them generously. Serve while still warm, and enjoy the comforting goodness!