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["Spray a 9"" square baking dish with nonstick cooking spray.", "Finely mince the scallion and set aside.", "Dice the potatoes into 1/2"" cubes and place in a large stockpot. Fill the pot with enough water to cover the potatoes. Set the pot over medium-high heat and bring to a boil. Boil the potatoes for 15-18 minutes, until they can be easily pierced with a fork.", "Preheat the oven to 350u00b0 F.", "Drain the potatoes into a colander, then transfer to a large mixing bowl. Add the minced scallion, crumbled bacon, butter, sour cream, 1/2 cup of milk, garlic powder, salt, black pepper, and shredded cheese to the bowl.", "Use a potato masher or large fork to smash the potato mixture until it is mostly smooth, leaving some pea-sized pieces of potato. Add 1/4 cup more milk if the mixture looks dry.", "Transfer the mashed potato mixture to the baking dish and use a rubber spatula to smooth it into an even layer.", "Transfer the casserole dish to the middle rack of the oven.", "Bake the potato casserole for 20-25 minutes, until it is bubbling at the edges and lightly golden brown on top.", "Remove the casserole dish from the oven.", "Allow the loaded baked potato casserole to rest for 5-10 minutes before plating and serving."]
