Preheat oven to 350 degrees F. Coat a 9×13 baking dish with nonstick cooking spray, set aside.
In large bowl whisk together both soups, sour cream, butter, chicken broth, salt, pepper, and
garlic powder until combined.
Stir in the peas, chicken, and spaghetti; toss to combine until fully coated.
Pour mixture into the prepared baking dish and sprinkle with the cheeses.
Cover with foil and bake for 30 minutes, then remove foil and continue baking for another 15
minutes until cheese is melted and casserole is hot throughout.
Remove from oven and sprinkle with parsley. Let stand 5-10 minutes.