Pour the beaten eggs over the mushrooms in the skillet. Let it cook undisturbed for a minute or until the edges start to set.
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If using cheese, sprinkle it over one half of the omelette.
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Using a spatula, carefully fold the other half of the omelette over the cheese and mushrooms. Cook for another minute or until the cheese is melted and the eggs are fully cooked.
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Slide the omelette onto a plate and serve hot. Enjoy!