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Prepare the Bread:
Preheat your oven to 375°F (190°C).
Slice the French bread in half lengthwise and scoop out some of the inside to create a shallow well.
Spread mayonnaise over each half of the bread to add a creamy layer and prevent sogginess.
Cook the Vegetables and Beef:
Heat olive oil in a skillet over medium-high heat.
Sauté the onions, bell peppers, and mushrooms until they start to soften, about 3-4 minutes.
Add the ground beef to the skillet. Cook, breaking up the meat, until browned and no longer pink. Drain any excess fat.
Add Flavorings and Thicken:
Stir in Worcestershire sauce, salt, and pepper.
Whisk together cornstarch and beef broth until smooth. Add to the skillet and simmer until the mixture thickens, about 2-3 minutes.
Assemble the Cheesy Bread:
Spoon the beef and veggie mixture evenly over each half of the bread.
Top with shredded cheese.
Bake:
Place the bread on a baking sheet and bake for about 15 minutes, until the cheese is melted and bubbly.
For a golden, crispy top, broil for the last 1-2 minutes.
Serve:
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