Cut the chicken breast into bite-sized pieces.
Finely chop the onion and garlic.
Thinly slice the zucchini and bell pepper.
Boil the spaghetti noodles in boiling water.
Add olive oil to a pan and sauté the garlic.
Add the chicken breast and cook thoroughly.
Add the onion, zucchini, and bell pepper, and stir-fry.
Add store-bought tomato sauce and bring to a simmer.
Add the boiled spaghetti noodles and mix with the sauce.
Season with salt and pepper to taste, and it’s done.