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Preheat oven to 375 degrees F.
Combine all ingredients, except for the green onions, in a 9×13 baking dish sprayed with cooking spray and bake, covered with tin foil, for 45 minutes.
Remove tin foil and continue baking for an additional 15 to 20 minutes until liquid is mostly absorbed and the potatoes are tender.
Remove from oven and let the casserole sit for 5 minutes so that any remaining liquid can be fully absorbed and sprinkle with green onions. Serve and enjoy!