Preheat your oven to 375°F (190°C).

In a large skillet, brown the ground beef over medium heat. Add the chopped onion and cook until the onion is translucent.

Stir in the ketchup, Worcestershire sauce, brown sugar, garlic powder, salt, and pepper. Cook for about 5 minutes until the mixture is heated through and slightly thickened.

While the meat mixture is cooking, slice the French or Italian bread in half lengthwise. Place the halves on a baking sheet, cut side up.

In a small bowl, combine the melted butter and minced garlic. Brush this mixture generously over the cut sides of the bread.

Spoon the Sloppy Joe mixture evenly over the bread halves, spreading it out to cover the surface.

Sprinkle the shredded mozzarella and cheddar cheese generously over the meat mixture.

Place the baking sheet in the preheated oven. Bake for about 15-20 minutes or until the cheese is melted and bubbly, and the edges of the bread are golden brown.

Remove from the oven and sprinkle with fresh parsley if desired.

Cut the cheesy Sloppy Joe garlic bread into individual pieces and serve warm.