In a large non-stick casserole dish, place the oil, the 2 skinless chickens cut into 4, the butter, all the spices and the parsley. Stir to impregnate the chicken with the spices. Place over low heat, cover and stir occasionally (about 10 min). Turn the chicken pieces over to allow the spices to soak in.
The heat should be medium to low for slow cooking without sticking, and you won't need to add water or very little.
Add the chopped onions, mix well, then cover and let it all cook (stirring occasionally). Add a little water if necessary, but onions normally release enough water.
Check the cooking after 45 minutes.
Remove from heat and place chicken pieces in a dish, draining well. You can place them in a colander. Let it cool.
Put the sauce left over from cooking the chicken on the stove to reduce (all the water should evaporate).
Then add 2 tablespoons of parsley, stirring frequently to prevent sticking.
The sauce is well reduced when you see the fat, which means there's no water left.
Beat 8 eggs with a fork and add to sauce, stirring constantly (consistency should be solid). If not, add two more beaten eggs. I put in a total of 10.
Finish by adding 2 tablespoons parsley (optional). The result should be a mixture with zero sauce.
De-bone chicken and cut into small pieces.
Once everything is cold, mix the 3 preparations successively in a large mixing bowl. Then mix everything together. The aim is to obtain a homogeneous mixture. I prefer this method to the old traditional version.
In traditional pastilla, the preparations are not mixed together. We make 3 distinct layers when we form the pastilla (one layer of chicken / one of onions and eggs / and almonds and cinnamon on top).
Taste and adjust sugar and cinnamon to taste.
Note: You can prepare the stuffing the day before and leave it in the fridge.