Step 1:Prepare the Ingredients

• Separate the egg whites from the yolks and place the egg whites in a bowl. Whisk them lightly until frothy.
• Wash and chop the spinach leaves.
• Finely chop the onion and mince the garlic.

Step 2:Cook the Spinach and Onion

• Heat the olive oil (or use cooking spray) in a non-stick skillet over medium heat.
• Add the chopped onion and cook until it becomes translucent, about 3-4 minutes.
• Add the minced garlic and cook for another 1 minute, until fragrant.
• Add the chopped spinach and cook until wilted, about 2-3 minutes. Remove the mixture from the skillet and set aside.

Step 3:Cook the Egg Whites

• Wipe the skillet clean and reapply a small amount of olive oil or cooking spray.
• Pour the whisked egg whites into the skillet, tilting the pan to spread them evenly over the surface.
• Cook the egg whites over medium-low heat until they start to set, about 2-3 minutes.

Step 4:Add the Filling

• Evenly distribute the cooked spinach and onion mixture over one half of the omelette.
• Sprinkle the crumbled feta cheese over the spinach mixture.

Step 5:Fold the Omelette and Serve

• Using a spatula, carefully fold the empty half of the omelette over the filling side.
• Cook for another 1-2 minutes, until the egg whites are fully set and the cheese is slightly melted.
• Slide the omelette onto a plate.
• Season with salt and pepper to taste.
• Garnish with freshly chopped herbs, if desired.