Cut the chicken breast into bite-sized pieces.
Chop the onion and tomato.
Add olive oil to a pan and sauté the onion.
Add the chicken breast and cook until the outside is cooked.
Add tomato and minced garlic, and stir-fry together.
Pour in water or chicken stock.
Season with salt and pepper.
Simmer over medium heat for 10 minutes.
Serve the finished stew in a bowl.