01 -
Preheat the oven to 375°F and move the rack to the top third of the oven.
02 -
Boil a large pot of water and cook the spaghetti 2 minutes less than package directions indicate.
03 -
In a medium prep bowl, combine the condensed chicken soup, sour cream, chicken broth, ranch seasoning mix, onion powder, garlic powder, and pepper. Stir until well mixed, then fold in the shredded chicken.
04 -
Drain the spaghetti and transfer it to a 9x13-inch casserole dish. Pour the prepared sauce over the spaghetti and toss until evenly combined. Spread the mixture in an even layer.
05 -
Top the spaghetti mixture with an even layer of grated parmesan and mozzarella cheese.
06 -
Bake the casserole, uncovered, in the preheated oven for 20 minutes, or until hot and bubbly. Optionally, broil for a few minutes to brown the cheese lightly, but watch carefully to avoid burning.