In a bowl, add the egg, yogurt, and feta cheese. Mix with a fork, breaking up the feta until the mixture is uniform.

Add the black pepper and flour, and mix well until the flour is fully incorporated.

Place the mixture on a piece of parchment paper and press it with your hands to form a square shape. Fold the corners of the parchment paper up to prevent the mixture from spilling, then cook in a sandwich press for 20 minutes on medium heat.

Enjoy!