Preheat your oven to 350°F (175°C) and grease a 9x13-inch baking dish.
If using pasta, cook about 2 cups according to package instructions, drain and set aside.
Shred or dice the cooked chicken into bite-sized pieces.
In a large mixing bowl, combine the cream of chicken soup, milk, and Alfredo sauce. Stir until blended. Add garlic powder, onion powder, salt, and pepper.
Add the shredded chicken and frozen mixed vegetables to the creamy sauce. Mix well and fold in half of the shredded mozzarella cheese.
Spread the chicken mixture in the greased baking dish. Prepare the stuffing mix according to package instructions and layer it over the chicken mixture. Sprinkle the remaining mozzarella cheese on top.
Bake for 30-35 minutes until bubbly and cheese is golden brown. Let cool for a few minutes before serving.