Dig out the insides of the bread buns to make them like boats. Smear the insides with margarine. Arrange them in an oiled tray, covered with baking paper.
In a separate bowl, cut the chicken meat, dice the tomatoes, crumble or grate the feta cheese, add salt to taste.
Fill the bread buns with this mixture.
Separately, whip the eggs and grate the cheese over them.
Stir well and pour this generously over the bread buns. Bake in an oven until the eggs are ready and the cheese melts.