Preheat oven to 350 °F (175 °C). Lightly grease a 9×13-inch baking dish.
In a large mixing bowl, combine chicken, cream of mushroom soup, onion dip, cheddar cheese, seasonings, hash browns, and melted butter. Mix well.
Spread mixture evenly into prepared baking dish. Cover with foil.
Bake for 30 minutes. Remove foil, sprinkle French fried onions on top.
Bake uncovered for 8 minutes, until golden and crispy.
Rest 5–10 minutes before serving.
Video
Notes
Substitutions: Cream of chicken soup, different cheeses, or frozen veggies.Storage: Refrigerate 4 days; freeze 2 months.Reheat: Warm covered at 350 °F until hot.