In a pan, sauté the onion and garlic, add the shredded chicken, the tomato sauce and season with salt and pepper to taste. Dilute a spoon of wheat flour in 2 spoons of water and add it to the stew. Let it cook for 10 minutes, stirring occasionally
Let the filling cool.
For the dough, place the flour, margarine and salt in a bowl and mix with your fingertips.
Add the egg and continue stirring. Gradually add the cold water until you form a smooth but firm dough. Let it rest for 15 minutes.
Roll out 2/3 of the dough and place on a baking sheet with a removable bottom. Put the stuffing and add the cheese on top. Cover with the remaining dough
Bake for 40 minutes or until golden.
Serve hot or cold.