I heat the oven to 375°F and grease a 9-by-13-inch baking dish.

I cook the pasta until just tender, then drain it.

I stir the pesto, cream cheese, milk, garlic powder, and Parmesan together until smooth.

I fold in the pasta and chicken, then spread everything in the dish.

I sprinkle mozzarella over the top and bake for 20 minutes, until hot and bubbly.