Preheat oven to 350-degrees. Coat an 8-inch square baking dish with cooking spray.
In a saucepan, bring water, butter, salt and pepper to a boil over high heat. Remove saucepan from heat and gently stir in potato flakes, onion and bacon bits until well combined.
Spoon potato mixture into prepared baking dish. Sprinkle with cheese then pour cream over top. Sprinkle with scallions.
Bake 35-40 minutes, or until heated through and edges are golden.
HEADS UP---for those of you who are skeptical about using potato flakes, TRUST ME ON THIS ONE---you won't be disappointed. And feel free to substitute shredded Cheddar cheese instead of the Swiss or your favorite variety.