In your mixer bowl, combine flour,salt,dry milk,sugar and yeast, mix well.
Add vinegar, butter and gradually add milk while needing. Keep needing until you have a soft dough that separates from you mixing bowl and not sticky.
Put the dough in a greased bowl, cover and let it rise for an hour or until doubled.
While the dough is doubling, cook chicken:
In a large deep skillet add remaining olive oil add the chicken and cook until done.
After the dough has risen, transfers to a clean lightly floured surface and cut into two unequal parts almost 1:2. Roll each part separately.
The larger part will go in the bottom of a 9 ½ inch pie pan.
Add the chicken, onion and sweet pepper.
Brush the rim of the bottom dough with some water and spread the other part to cover. Seal the edges.
Brush with egg and sprinkle some sesame seeds on top.
Bake in a 400F oven for 20 minutes until the crust is golden brown.
Remove from oven, let it stand and cool a bit, cut and serve.
Enjoy.