Pour the egg mixture over the spinach. Let it cook undisturbed for 1-2 minutes until the edges start to set.
Sprinkle the shredded cheese evenly over one half of the omelette.
Using a spatula, gently lift the edges of the omelette and fold it in half over the cheese. Cook for another 1-2 minutes until the cheese melts and the eggs are fully set.
Carefully slide the omelette onto a plate and serve immediately. Enjoy your savory spinach and cheese omelette!