Preheat oven to 375°F and spray a 9x13-inch baking dish with cooking spray.
In the prepared baking dish, combine uncooked ground chicken, coleslaw mix, soy sauce, sesame oil, garlic, ginger, and pepper, mixing everything together until well combined.
Spread the mixture evenly in the dish and sprinkle green onions over the top.
Cover tightly with foil and bake for 25 minutes until chicken is cooked through.
Remove foil, sprinkle shredded mozzarella cheese over the top, and return to oven uncovered for 5-7 minutes until cheese is melted.
Top with wonton strips or chow mein noodles and serve immediately with sweet and sour sauce on the side.