01 -
Preheat oven to 190°C. Lightly spray a 23x33 cm casserole dish with cooking spray to prevent sticking and ensure even browning.
02 -
In a large bowl, mix cream of chicken soup, sour cream, diced tomatoes with juices, frozen fire-roasted corn, half of the shredded cheddar cheese, Ranch seasoning, and Montreal steak seasoning until smooth.
03 -
Gently fold shredded rotisserie chicken into the creamy mixture until evenly coated.
04 -
Spread half of the frozen hashbrowns evenly on the bottom of the prepared dish. Spoon the chicken mixture over the hashbrowns and smooth into an even layer. Top with remaining hashbrowns, pressing gently to compact. Sprinkle remaining shredded cheddar cheese evenly on top.
05 -
Cover loosely with aluminum foil and bake for 20 minutes to heat through while retaining moisture.
06 -
Remove foil and bake for an additional 25 to 30 minutes until bubbling, the top is golden brown, and cheese is melted. Optionally broil briefly for extra crispiness, monitoring closely to prevent burning.
07 -
Allow casserole to rest for 5 minutes to set before serving. Garnish with sliced green onions and fresh cilantro for brightness.