Heat your pan to medium. Spray with a thin and even layer of cooking spray.
Add baby spinach to the pan. Stir and cook until wilted, about 2-minutes.
Stir in sun dried tomatoes. Spread the ingredients evenly throughout the pan.
Pour in egg whites. Sprinkle with Italian seasoning and salt.
Immediately press your tortilla on top of the egg whites. Press down gently with your hands or the back of a spatula to ensure they stick together.
Cover and cook for about 2-minutes. You’ll know you’re ready for the next step when the tortilla and eggs are stuck together, and can easily slide around the pan.
Carefully flip. Now, your tortilla should be on the bottom and the egg whites on top.
Sprinkle with mozzarella and feta. Cover and let the cheese melt for 1-minute.
Use a flipper to fold in both sides of your tortilla in a letter fold. Brown the bottom of your folded tortilla for 1-2 minutes, flip, and repeat on the other side.
Remove from the pan and cool for 5-minutes on a cutting board. Slice in half, and enjoy!