Cut the chicken breast into bite-sized pieces.
Julienne the onion and bell pepper.
Heat olive oil in a pan and stir-fry the chicken breast.
Add the onion and bell pepper, and stir-fry together.
Add chopped tomatoes and salt, then bring to a simmer.
Make a small well in the sauce and crack an egg into it.
Cover with a lid and cook on low heat until the egg is done.