Preheat your oven to 350°F (175°C).
In a bowl, mix together the Parmesan cheese, mozzarella cheese, egg, and onion powder until well combined.
Evenly distribute the mixture onto a parchment paper-lined baking sheet.
Bake for 15 minutes, or until bubbling and brown, in a preheated oven.
Remove from the oven and let cool slightly before cutting into pieces.
