Heat 2 tbsp olive oil in a sauce pan on medium-low. Sauté chopped onions for 5 min. Add garlic and sauté for another minute. Add chicken breast cubes, increase heat to medium, and cook until chicken is tender and no longer pink.
Cook the pasta in excess salted water; drain after the pasta has cooked al dente (or 1 min less than box instructions).
Add zucchini (cut round or in small cubes or julienne style). Add salt and freshly ground black pepper. Cook until zucchini is tender.
Add the drained pasta and sun dried tomatoes to the zucchini sauce. Mix to coat well. Sprinkle with freshly chopped parsley and grated Parmesan cheese.