Cut the chicken breast into bite-sized pieces.
Chop the onion and garlic.
Dice the tomatoes.
Heat olive oil in a pot and sauté the garlic and onion.
Add the chicken breast and cook until the outside is no longer pink.
Add the tomatoes and stir-fry together.
Pour in water or chicken stock and bring to a boil.
Season with salt and pepper.
Once all the ingredients are cooked, turn off the heat and serve in a bowl.