This afternoon I made small pies stuffed with feta cheese, and they tasted so delicious! Rafael and Eleni already ate some of them after I had brought them to home from school, and they loved this snack! So, why not share this recipe with you? I took this recipe from a
Greek cooking blog called Betty's Cuisine (Greek language). Let me translate the recipe in English with a few modifications of my own:

Recipe for small pies stuffed with feta cheese
Ingredients for 30 pies:
For the dough:
100 gr butter
1 yogurt 200 gr (I prefer FAGE yogurt)
2 cups flour, all-purpose
1 teaspoon baking powder
½ teaspoon baking soda
½ teaspoon salt
For the filling:
150 gr feta cheese
1 egg
pepper
1 egg yolk for brushing
Procedure:
Beat the butter in a mixer for 3-4 minutes. Add the yogurt to the butter, and beat it for a few minutes.
Mix the flour with the baking powder, baking soda and salt, and gradually mix into the butter. Beat until you get a smooth and elastic dough, which will not stick your hands and also is easily kneaded.
In the meantime, crumble the feta cheese and the egg with a fork. Add a little freshly-ground black pepper. Preheat the oven to 350 F.
Dust the dough with a little flour on both sides and put it on a clean surface.
Roll the kneaded dough with a rolling pin. When the dough becomes thin, cut out discs using a small plate with a diameter of about 10 cm for guidance.
Fill each disc with a spoonful of the cheese mix, as shown in the picture below.
Fold each disc over and pinch the edges together with a small fork.
Brush the discs with the egg yolk mixed with a little water. I also added sesame seeds.
Place the pies on an oven tray lined with parchment paper. Bake them for about 20 minutes until they are golden-brown.
Enjoy the pies hot or cold!