Loaded Mashed Potato Casserole

A fork slides through a potato chunk with no pushback, and the whole pot smells warm and earthy—that’s the moment this casserole starts to come together. Loaded mashed potato casserole takes that soft, buttery mash and gives it a blanket of melted sharp cheddar, crisp bacon, and fresh green onion. Each scoop has creamy potatoes underneath and a savory topping that adds crunch and a little bite.

I like this version because it still tastes like mashed potatoes first, not a pile of toppings hiding underneath. The cream cheese and sour cream make the center rich and tangy, while the cheddar and bacon bring the familiar loaded-potato flavors across the top. It’s a generous casserole for a holiday table or a dinner when you want a substantial side that can be spooned right from the baking dish.

The Oven Melts the Topping; It Won’t Rescue Undercooked Potatoes

The potatoes need to be completely tender before they go into the baking dish. The oven time is short enough to warm the finished mash and melt the cheddar, but it isn’t a second round of cooking for firm potato centers. If a chunk still resists a fork when you drain the pot, that firmness will be noticeable in the casserole too.

That distinction also helps the topping stay in balance. The potatoes are cooked and seasoned before the cheese and bacon go on, so the oven can focus on heating the middle and joining the toppings to the surface. Bake until the center is hot and the cheddar has melted; waiting for a browned, deeply baked crust isn’t necessary for this casserole. The result should be creamy underneath, with the bacon and cheese clearly visible on top rather than buried in the mash.

Russets, Warm Milk, and Cream Cheese Build the Texture

• Russet potatoes — Their fluffy, starchy texture makes a soft mash that holds the rich dairy without feeling waxy. Yukon Golds can stand in at the same weight; they make a creamier, denser mash with a more buttery potato flavor.
• Butter and cream cheese — Butter rounds out the potatoes, while softened cream cheese adds body and helps the mash feel cohesive. Full-fat cream cheese gives the richest result; Neufchâtel can replace it in the same amount for a slightly less rich finish. Let the cream cheese soften before mashing so it blends without cold lumps.
• Sour cream and whole milk — Sour cream brings a gentle tang that keeps the rich potatoes from tasting flat. Plain full-fat Greek yogurt can replace the sour cream measure for measure, though the flavor will be tangier. Whole milk gives the mash a fuller body; warm it before stirring it in, and know that lower-fat milk will make a slightly less rich result.
• Bacon — Regular bacon gives the topping its salty crunch and cooks evenly in the skillet. Choose bacon you enjoy eating on its own; it’s one of the most noticeable flavors in each bite. Draining it before crumbling keeps excess grease from pooling over the cheese.
• Sharp cheddar — Sharp cheddar gives the topping a distinct, savory edge against the mild potatoes. A block you shred yourself melts smoothly, while pre-shredded cheddar is convenient and still works well across the top.
• Green onions — Thinly sliced green onions add a fresh, gently sharp finish after baking. They’re best added at the end, where their color and crispness contrast with the warm, soft casserole.

From Fork-Tender Potatoes to a Scoopable Casserole

Cook the potatoes until a fork slips in easily

Heat the oven to 350°F. Put the peeled, 1 1/2-inch potato chunks in an 8-quart pot, cover them with cold water by 1 inch, and add 1 tablespoon of the kosher salt. Bring the water to a boil, then lower the heat to a simmer. Cook for 15–20 minutes, until a fork pierces the chunks easily; if the center still feels firm, give them more time in the simmering water.

Mash while the potatoes are hot

Drain the potatoes and return them to the pot. Grease a 9×13-inch baking dish with 1 tablespoon of butter. Mash the potatoes with the remaining butter and the softened cream cheese, then stir in the sour cream, warmed milk, remaining 1 teaspoon kosher salt, and black pepper. Stop once the mixture is combined and creamy; vigorous mixing can make mashed potatoes heavy and gluey.

Cook the bacon until crisp

Set a 12-inch skillet over medium heat and cook the bacon for 8–12 minutes, turning it as needed. Look for crisp slices rather than soft, floppy ones, since the bacon will sit on top of the creamy potatoes. Transfer it to paper towels to drain, then crumble it once it’s cool enough to handle. If it’s still bendy, give it another moment in the skillet before draining.

Top, bake, and finish with green onion

Spread the mashed potatoes in the buttered baking dish, then distribute the shredded cheddar and crumbled bacon evenly over the surface. Bake for 25–30 minutes, until the casserole is hot in the center and the cheese is melted. Sprinkle the thinly sliced green onions over the top after it comes out of the oven. Let it rest for 10 minutes before serving.

Small Changes That Keep the Loaded-Potato Character

Questions That Come Up Before the Casserole Goes in the Oven

Loaded Mashed Potato Casserole

Loaded mashed potato casserole combines creamy mashed russet potatoes with sharp cheddar and crisp bacon in a baked 9x13-inch dish. Green onions add a fresh finish after the casserole rests for 10 minutes.

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Prep Time 20 minutes mins

Cook Time 56 minutes mins

resting 10 minutes mins

Total Time 1 hour hr 26 minutes mins

Servings: 10 servings

Course: Side Dish

Cuisine: American

Calories: 520

Ingredients Equipment Method Notes

Ingredients

  

Make the potatoes

• 5 lb russet potatoes peeled and cut into 1 1/2-inch chunks
• 1 tbsp kosher salt divided
• 1 tsp kosher salt divided
• 0.5 cup unsalted butter divided
• 1 block (8 oz) cream cheese softened
• 1 cup sour cream
• 0.5 cup whole milk warmed
• 0.5 tsp black pepper

For the topping

• 8 oz bacon
• 2 cups sharp cheddar cheese shredded
• 0.33 cup green onions thinly sliced

Equipment

• 1 9x13-inch baking dish
• 1 12-inch skillet

Method

 

Make the potatoes

1. Preheat the oven to 350°F.
2. Put the potatoes in an 8-quart pot and cover with cold water by 1 inch; add 1 tablespoon salt. Bring to a boil, reduce the heat, and simmer for 15–20 minutes, until the potatoes are easily pierced with a fork.
3. Drain the potatoes and return them to the pot.
4. Grease a 9x13-inch baking dish with 1 tablespoon butter.
5. Mash the potatoes with the remaining butter and cream cheese; stir in the sour cream, warm milk, remaining 1 teaspoon salt, and pepper.

Cook the topping

1. Cook the bacon in a 12-inch skillet over medium heat for 8–12 minutes, turning as needed, until crisp.
2. Drain the bacon on paper towels and crumble it.

Assemble and bake

1. Spread the mashed potatoes in the prepared baking dish.
2. Top the potatoes evenly with the cheddar and crumbled bacon.
3. Bake for 25–30 minutes, until hot in the center and the cheese is melted.
4. Sprinkle with the green onions.
5. Let the casserole rest for 10 minutes before serving.

Notes

For the smoothest texture, mash the potatoes while hot. Refrigerate leftovers for 3–4 days; freezer storage is possible, though the texture may soften after thawing. For a lactose-free variation, use lactose-free cream cheese, sour cream, milk, and cheddar.