To freeze: Cool completely, wrap tightly in plastic wrap and foil, and freeze for up to 2 months. Thaw in the refrigerator overnight before reheating.
Reheating: Reheat defrosted or leftover quiches in a 400°F (200°C) oven for 10 minutes to restore crispness.
Variations: Experiment with different fillings like spinach and feta, ham and gruyère, or sun-dried tomatoes and goat cheese.