Heat an 8- to 10-inch skillet over medium heat. Add the butter and heat until melted and frothy, about 30 seconds. Add the hot dog and brown for 1 minute. Add the onions and cook for 1 more minute. Add the eggs and swirl around the skillet. Season with salt and pepper. Add the cheese on top of the egg.
Place the lid on the skillet, turn off the heat and walk away. Make some coffee, have an orange juice, make your toast, read the news, etc. Return in 5 to 7 minutes; the cheese should be melted and the eggs set. Roll up the omelet, place on a plate and serve. Enjoy!
For more ingredient substitution ideas, see the article below.