I decided to give it a try.
I cut up onion, squash and tomato and put it in a deep frying pan. Then on top I put two "rings" of the squash, added some oil, covered and cooked it until soft.
Finally, I put an egg in the hole, covered and cooked some more.
The rest is history.
Give it a try making it your own, different vegetables, some cheese on top.
Tell be how yours came out, your variations etc.