Cut the chicken breast, tomato, onion, and garlic into bite-sized pieces.
Cook the pasta in boiling water.
Heat olive oil in a pan and sauté the garlic and onion.
Add the chicken breast and stir-fry until cooked through.
Add tomatoes and tomato sauce, then bring to a simmer.
Add the cooked pasta and mix with the sauce.
Season with salt and pepper to taste and serve.