Blend crackers, evaporated milk and aji. Blend until creamy, about 2-3 minutes. Add shredded chicken breast and blended cracker mixture to pot on medium heat. Stir and let it reduce on low heat until it is creamy. If it is too thick you can add more evaporated milk. Stir constantly to avoid burning. Taste it to check for saltiness. Serve ají de gallina over yellow potatoes with white rice. Garnish with slices of hard boiled egg and black olives.
Note: you can add more Aji amarillo(yellow paste) if so desires a spicier dish.