Create a delicious and healthy meal with these Mediterranean Quesadillas filled with spinach, feta, mozzarella, and red onion. This quick recipe is perfect for busy weeknights or casual gatherings, delivering a delightful blend of creamy cheeses and fresh vegetables wrapped in crisp whole wheat tortillas. Not only are they simple to prepare in under 30 minutes, but they also offer the flexibility to customize with your favorite ingredients. Whether served as a light lunch or a satisfying dinner option, these quesadillas are sure to be a hit with the entire family.