Marinate the chicken for 3 hours (the full 3 hours really lets the spices soak in).
Preheat oven to 400°F and bake for 35 to 45 minutes.
Blend the aji verde ingredients together.
NOTE: The avocado in the aji verde gives it that creamy texture without needing a ton of mayo or sour cream. Adjust the serrano or jalapeño depending on how spicy you like it. Credit: Caroline Cubero (@caroline.cubero).