1Cut the chicken breast into thin strips.
Heat the olive oil in a large skillet over medium-high heat.
Add the chicken strips to the skillet and cook until they are no longer pink, about 5-7 minutes.
While the chicken is cooking, chop the onion into thin slices.
Add the sliced onion to the skillet and cook until it becomes translucent, about 3-4 minutes.
Add the mixed vegetables and shredded cabbage to the skillet and stir-fry for another 5 minutes.
Pour in the tomato sauce and mix well to coat all the ingredients.
Cook for an additional 2-3 minutes, until the vegetables are tender but still crisp.
Serve hot and enjoy your Chicken and Vegetable Stir-Fry.