Step 1 of 10
Loaded Baked Potato Casserole
Spray a 9x13-inch baking dish with nonstick cooking spray. Set aside.
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Step 2 of 10
Loaded Baked Potato Casserole
Finely mince the scallions and set aside.
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Step 3 of 10
Loaded Baked Potato Casserole
Dice the potatoes into 1/2-inch cubes and place in a large pot. Fill with enough water to cover the potatoes. Set the pot over medium-high heat and bring to a boil. Boil the potatoes until they can be easily pierced with a fork, 15-18 minutes.
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Step 4 of 10
Loaded Baked Potato Casserole
Preheat the oven to 350°F.
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Step 5 of 10
Loaded Baked Potato Casserole
Drain the potatoes into a colander, then transfer to a large mixing bowl. Add the minced scallion, crumbled bacon, butter, sour cream, milk, garlic powder, salt, black pepper, and shredded cheese to the bowl.
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Step 6 of 10
Loaded Baked Potato Casserole
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 more milk if the mixture looks dry.
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Step 7 of 10
Loaded Baked Potato Casserole
Transfer the mashed potato mixture to the casserole dish and use a rubber spatula to smooth it into an even layer.
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Step 8 of 10
Loaded Baked Potato Casserole
Bake the potato casserole on middle rack of oven until it is bubbling at the edges and lightly golden brown on top, 20-25 minutes.
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Step 9 of 10
Loaded Baked Potato Casserole
Check to see that casserole is done. Remove from oven or add time as needed.
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Step 10 of 10
Loaded Baked Potato Casserole
Allow the casserole to rest for 5-10 minutes before serving.