Add in the salt, pepper, chilies, and milk into the egg. Mix it thoroughly. ( * Add in herbs like oregano if you don't like chili/pepper even that tastes great.
Then add the onion and tomatoes to the mix.
Finally, add in the cubed bread and leave it aside for few minutes till the bread soaks in the egg. ( Don't let the bread stay in for long. It gets soggy and loses the texture that we need.)
Heat a nonstick pan and coat it with oil. Pour on the bread-egg mix and let it fry till crisp.