Start by cutting the red onions into round slices.
In a skillet, add one drizzle of olive oil, cover the bottom of the skillet with the onion slices and pour in the whole eggs, season with the salt and the black pepper and, using a fork, break the eggs and mix well.
Top it all with the grated mozzarella cheese, add the mini toasts, arranging them one next to the other just like shown in the video, and gently tap them down with a fork.
Cover the skillet and let it all fry for 5 minutes.
Serve.