Brought this to many parties, and it's always a crowd favorite

Preheat the oven to 375°F (190°C).
Slice the French bread in half lengthwise and place it on a baking sheet, cut sides up.
In a large skillet over medium heat, cook the ground beef and chopped onion until the beef is browned and fully cooked through. Drain excess fat.
Stir in the minced garlic and cook for another minute until fragrant.
Remove from heat and mix in the mayonnaise, ketchup, mustard, salt, and pepper. Spread this mixture evenly over the cut sides of the bread.
Sprinkle the shredded cheddar and mozzarella cheeses evenly over the top of the meat mixture.

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