For a richer flavor, try using whole milk powder in the dough. Make sure to squeeze as much moisture as possible from the thawed spinach to prevent soggy Fatayer. Feel free to experiment with other fillings, such as feta cheese and herbs, or ground meat and spices. Fatayer can be made ahead of time and reheated before serving. Store in an airtight container in the refrigerator for up to 3 days.