Boil the chicken breast in boiling water until cooked, then shred along the grain.
Cut the cherry tomatoes in half.
Thinly slice the red onion.
Cook the pasta noodles, rinse them with cold water, and drain.
Place the pasta noodles, chicken breast, cherry tomatoes, and red onion in a bowl.
Drizzle with olive oil, balsamic vinegar, salt, and pepper, then toss everything together.