Prepare the Dough: In a large bowl, combine flour, salt, milk, water, and honey. Knead for 10–12 minutes until smooth. Cover and let rest for 10 minutes.
Prepare the Coating: Mix panko breadcrumbs, Parmesan cheese, and dried parsley in a bowl. Set aside.
Cook the Chicken: Heat olive oil in a pan over medium heat. Add diced chicken, salt, onion powder, garlic powder, and black pepper. Cook for 6–7 minutes until golden and fully cooked. Let cool.
Make the Sauce: In a bowl, mix mayonnaise, crème fraîche, Parmesan cheese, mustard, and dried chives until smooth. Combine with the cooled chicken.
Shape the Flatbreads: Divide dough into 8 equal balls. Roll each into a flat circle. Place a slice of cheese and chicken mixture on one half. Fold and seal edges firmly.
Coat the Flatbreads: Whisk milk and egg together. Brush each flatbread with the mixture, then coat in the panko mixture.
Fry: Heat sunflower oil to 175°C (350°F). Fry in batches until golden brown and crispy. Drain on paper towels and serve warm.