Slice the loaf from the rounded side, without cutting it all the way through, so that it opens up like a book.
In a mixie, blend together extra virgin olive oil, garlic cloves, and chopped parsley / coriander leaves, till it forms a semi smooth paste - some texture is okay. Set aside.
Now open up the loaf, and spread the garlic oil (liberally) - on the inside.
Close the loaf, cover it completely in foil & put it in the oven at 400 F for 10 mins. This step is important to ensure the garlic oil seeps through the warm bread.
Once the time is up, take the bread out of the oven, open it up, then first sprinkle the mozzarella cheese, followed by the parmesan cheese. Finally sprinkle a little black pepper - though this is optional.
Put the bread back in the oven, this time with the loaf spread wide open for 10 more minutes at 400 F or until the mozzarella cheese has melted and the parmesan has developed a beautiful golden/light red color.
Once it's done, take it out of the oven, set it aside to cool for a few minutes, and then serve warm.
Cut & serve this as is, or pair it with a dip of your choice.