In a small bowl, mix the eggs and milk until well combined. Add a pinch of salt to the egg mixture. Add your veggies to the egg mixture. Pour the egg mixture into a well-greased 6"x3" pan. Place the pan into the basket of the air fryer. Cook at 350º Fahrenheit for 8-10 minutes. Halfway through cooking sprinkle the breakfast seasoning onto the eggs and sprinkle the cheese over the top. Use a thin spatula to loosen the omelette from the sides of the pan and transfer to a plate. Garnish with extra green onions, optional