Preheat oven to broil.
In a small bowl, combine all the ingredients for the chimichurri (parsley, cilantro, red chili, oregano, garlic, olive oil, salt, black pepper, and vinegar). You can use it right away or let it sit for at least 30 minutes for even more flavor.
Cut the loaf of french bread in half long ways. Optional, cut off both ends of the loaf if you don't like them. Lay both halves on a baking sheet lined with parchment paper.
Make sure to mix the chimichurri well and then spread some on top each half loaf with a light hand so it's not too oily. Sprinkle grated parmesan on top (as much or as little as you'd like) and then add the shredded mozzarella on top. Add a little or a lot depending how cheesy you like it.
Pop in the oven to broil on a middle rack and watch it closely so it doesn't burn. After 5 to 8 minutes, the cheese will be bubbly and the edges will be golden brown and crispy.
Take the tray out of the oven. Cut the loaves into triangle or rectangle slices and enjoy!
