Set oven to 350°F (180°C). Prepare a baking tray covered with baking paper and evenly spread out the cooked quinoa. Bake for around 20-25 minutes, checking often and stirring to avoid burning. Once quinoa is crispy, set aside to cool.
Increase the oven temperature to 390°F (200°C).
Whisk the egg in a bowl together with the Parmesan and herbs. Prepare a separate plate with the quinoa. Dip the chicken chunks first in the egg, then coat with the quinoa.
Place the chicken nuggets on a baking tray covered with baking paper and bake for about 15-20 minutes, until chicken is cooked through.