Gather all your ingredients. In a bowl, crack the eggs and beat them vigorously until frothy. Set aside.

Heat a non-stick skillet over medium heat, adding butter or oil. Once melted, sauté the cleaned spinach for 1-2 minutes until wilted.

Pour the beaten eggs over the sautéed spinach. Tilt the skillet to ensure eggs cover the spinach. Let it settle for about 30 seconds without stirring.

Cook undisturbed for 2-3 minutes until the edges start setting. Sprinkle feta cheese over one half of the omelette.

Fold the omelette in half with a spatula and cook for an additional minute until cheese is melted. Serve warm.