Dice the potato into 1.5cm cubes and soak in water to remove excess starch. Drain the water. Trim the ends of the green beans and cut them into 1cm pieces.

In a bowl, mix the egg mixture ingredients (eggs, Parmesan cheese, and salt) until well combined.

Heat salad oil in a frying pan over medium heat. Add ground meat and cook until the color changes. Add potatoes, green beans, salt, and pepper, and sauté until the potatoes become translucent. Flatten the mixture evenly in the pan.

Pour the egg mixture over the sautéed ingredients, shape it evenly, cover with a lid, and cook on low heat for 5 minutes. Flip the omelette and cook for another 5 minutes.