Combine bread and milk in a bowl and let sit while you begin chopping onions and cooking. Let sit for at least 10 minutes.
Heat oil in large stockpot.
Add onions and saute until translucent (about 3 minutes).
Add garlic, aji amarillo paste, and pepper. Saute for 2 minutes.
Reduce heat and add in nuts, if using.
Over medium low heat, add in chicken and bread and milk mixture. Stir to combine well.
Raise heat to medium and add in parmesan cheese.
Stir untill cheese is completely melted.
Add chicken broth.
Stir and taste. Add salt if needed
Reduce heat and cover.
Cook, stirring occasionally, for 20 minutes.
Add additional chicken broth if needed to thin.
Serve over rice with a hard boiled egg and olive.