Add all of the marinade ingredients to a bowl or baggie and mux up. Break up the adobe pepper. Add the flattened chicken breasts.
When ready to grill. remove the baggie from the fridge and grill until cooked through.
Mix everything, except the avocados, in a medium bowl. Once mixed, chunk the avocados and add to the bowl. Carefully stir so that the avocados don't break up too much, unless you are going for more of a guacamole mixture.
Serve the hot chicken breasts with the avocado salad.