|source: Google Images|
Mine look way more appetizing, and don't last long enough to get a picture
Bake your potatoes, put in the oven @350 for 1 hour.
In the meantime saute or caramelize onions. If you want you can put in other vegetables, I added red pepper, and mushrooms to the mix.
Beat eggs, you can add milk, and spices of your choosing. You can add the vegetables into the eggs, or you can mix it with the potatoes you're going to scoop out, or do both.
When the potatoes are ready, slice them lengthwise, so you end up with 2 long halves. This is also the point at which you raise the temperature of the oven to 400. Scoop out the potato from the middles creating a bowl in each half.
Pour the egg mixture into the potatoes. If it doesn't all fit into the potatoes, you can butter & bake it in a square pan or muffin pans without liners. You can also just use more potatoes.
Shortcut: Bake your potatoes using sensor cook in the microwave, just make sure you don't make an x make a slit on the side you're going to be cutting it on.