Add the onion, and saute for 2 minutes until the onion softens. Then add garlic, and cook for 30 seconds. The chicken won’t be fully cooked but that’s okay as it will be cooked further with the pasta.
Sprinkle the crunchy breadcrumbs on top of the pasta, and the remaining mozzarella cheese. Cover with a lid, and allow it to sit for 5 minutes. The sauce will thicken, and the cheese will melt. Garnish with fresh basil, and serve.