Step 1

Preheat oven to 425°F. Spray an 8-inch square baking dish with cooking spray and set aside.

Step 2

In a large bowl, whisk together condensed soup, milk, chicken broth, salt, pepper, and garlic powder. Stir in onion, mushrooms, bell pepper, celery, raw chicken, uncooked pasta, and ½ cup cheese.

Step 3

Transfer mixture to prepared baking dish. Cover tightly with foil and bake for 45 minutes.

Step 4

Remove foil and give everything a stir in the dish. At this point, check to make sure that the pasta is al dente (tender, but with a firm bite). If it’s still too hard, cover again and return to the oven until the pasta is al dente. Once the pasta is al dente, sprinkle remaining ½ cup of cheese over top.

Step 5

Return to the oven and bake, uncovered, for 5-10 more minutes, or until pasta is tender, chicken is cooked through, and cheese is melted.