In a mixing bowl, combine flour, salt, sugar, and yeast.

Add warm water and olive oil, then knead until smooth.

Let the dough rise in a warm place for about 1 hour.

In a bowl, mix feta cheese, mozzarella cheese, egg, and yogurt until well combined.

Preheat the oven to 450°F (230°C).

Roll out the dough into a circle, place the filling in the center, and fold the edges over.

Place on a baking sheet and bake for 20-25 minutes until golden brown.