Cook pasta as per package instructions; drain and set aside.

Preheat oven to 375°F.

In a saucepan over medium heat, bring milk to just boiling or until small bubbles appear around the edges, about 5 minutes. Add garlic salt, pepper, and about 3/4 of the shredded cheese; whisk until melted.

Combine sauce with chicken, parsley and cooked pasta in a baking dish. Top with remaining cheese. Bake for 20 minutes or until bubbling and browned on top.