Wash the chicken breast and all vegetables thoroughly and cut them into bite-sized pieces.
Heat olive oil in a pot, then sauté onions and garlic until fragrant.
Add the remaining vegetables and chicken breast to the pot and sauté together.
Pour in tomato sauce and water, then bring to a boil.
Simmer on medium-low heat for about 20 minutes until all ingredients are cooked through.
Season with salt and pepper to taste, then serve.