Add your sliced onions, green chilis, and salt into a bowl. Mix everything well, mashing a little with your finger (wear gloves).
Then add in your eggs (+milk/sugar/cilantro if using). Whisk everything together until nice and frothy.
Set your pan to heat on medium low. Pour in a bit of oil. Then take your bread slice and dip it into the mixture.
Make sure all sides of the toast is covered in egg, then pick up some of the onions and chilies and spread it onto one side of the toast.
Gently place the toast onto the pan, chili/onion side down. Then take some more of the chilies and onions from the mixture and spread it on to the other side.
Your toast is done once the bubbling on the edges subside. Flip gently, and fry until nice and golden brown on both sides.
Transfer to a wire rack. Once it cools down a little, sliced them down the middle into triangles. I like to use scissors for this.
Now, plate your toast, sprinkle with some cilantro if you want, and enjoy!