01 -
Preheat oven to 375°F and move the rack to the top third of the oven. Boil a large pot of water and cook pasta 2 minutes less than package directions indicate.
02 -
Meanwhile, combine cream of chicken soup, sour cream, chicken broth, ranch seasoning, onion powder, garlic powder, and pepper in a medium bowl. Stir in the chicken.
03 -
Drain the spaghetti and add it to a 9x13 casserole dish. Pour the sauce mixture over the spaghetti and toss to combine.
04 -
Spread mixture in an even layer, then top with Parmesan and mozzarella. Bake uncovered for 20 minutes or until hot and bubbly.
05 -
You can broil for a few minutes to brown the cheese if desired - watch carefully so it doesn't burn!