ZUCCHINI AND PEPPERS OMELETTE WITH CHEDDAR CHEESE

Good morning breakfast!
We love omelette with ham, bacon or sausages, but we love vegetables omelette also.
This omelette is made of:
1/2 chopped green pepper,
2 thin sliced zucchini,
1/2 cup chopped onion,
4 eggs,
1/4 cup milk,
1/2 cup shredded cheddar cheese,
salt and pepper,
1 tablespoon butter;
First, beat eggs with milk and set aside; second, saute vegetables in butter for 1,2 minutes; add salt and pepper; pour eggs over the vegetables, turn heat to very low, cover completely and let cook for few minutes until eggs are not liquid any more;turn off heat; top with cheese and cover again until cheese is melted; slide omelette on on the plate and serve.