01 -
Preheat oven to 375 degrees F. Spray a 9x13-inch casserole or baking dish with cooking spray.
02 -
In a large mixing bowl, combine cream of chicken soup, sour cream, diced tomatoes with green chilis (undrained), frozen fire-roasted corn, half of the shredded cheddar cheese (1 cup), Ranch seasoning mix, and Montreal steak seasoning. Stir thoroughly to blend.
03 -
Add shredded rotisserie chicken to the mixture and stir to combine evenly. Set aside.
04 -
Spread half of the frozen hashbrowns (15 ounces) evenly in the prepared baking dish. Spoon the chicken mixture over the hashbrowns and spread evenly. Top with the remaining hashbrowns and gently press down to compact. Sprinkle the remaining shredded cheddar cheese on top.
05 -
Cover the dish loosely with aluminum foil and bake at 375 degrees F for 20 minutes.
06 -
Remove foil and bake for an additional 25 to 30 minutes until the casserole is bubbly, hashbrowns are golden, and cheese is melted. Optionally, place under broiler for a few minutes to further brown the top.
07 -
Remove from oven and let stand for 5 minutes. Garnish with sliced green onions and fresh cilantro before serving.