Wash the spinach thoroughly and remove excess moisture.
Crack the eggs into a bowl and beat well with salt and pepper.
Add olive oil to a pan and sauté the spinach until wilted.
Add feta cheese to the spinach and mix gently.
Pour the egg mixture into the pan and cook slowly over low heat.
When the eggs are half-cooked, place the spinach and feta cheese mixture on one side.
Fold the omelette in half and cook until fully set.