Begin by making the meatballs.
In a medium bowl add the ground chicken, egg, and both bread crumbs.
Mix until completely combined.
Roll into 1 tablespoon-sized meatballs, and place on a baking sheet. Bake at 375° for 15 minutes or until the internal temperature is 165°.
In a 5-quart pot or dutch oven, saute the onion and garlic in a tablespoon oil.
Add in the chicken broth, diced tomatoes, and oregano.
Bring the broth to a simmer (small bubbles) then slowly stir and drizzle in the cornstarch mixture, until thickened.
Add in the meatballs (that you cooked) and the pasta, and simmer on medium-low until the pasta is cooked about 8 minutes.
Ladle into oven-safe serving bowls and top with mozzarella cheese. Place them onto a baking sheet lined with parchment for easy cleanup.
Place under the broiler for 2-3 minutes or until the cheese is melted and golden,