1. Beat the eggs with sour cream, add a little salt and pepper (the cheese is also salty).
2. cut the Tomato into cubes and grate the cheese.
3. grease a frying Pan (24 cm in diameter) with butter. Pour out the egg mixture and close the lid. Turn the fire on medium.
4. when the omelet is fried from the bottom, turn it over with a wide spatula. Put the tomato on it, sprinkle with cheese and Basil.
Cover and fry for a couple more minutes. Fold the omelet in half, fry until nicely browned and serve with a sprinkle of Parmesan.