Loaded Mashed Potato Casserole
If there’s one dish that always disappears quickly at family dinners, potlucks, and holiday tables, it’s Loaded Mashed Potato Casserole. Creamy mashed potatoes are mixed with butter, sour cream, cheese, crispy bacon, and green onions, then baked until hot, bubbly, and golden on top. It’s everything you love about loaded baked potatoes—but in a rich, comforting casserole that feeds a crowd.
This recipe is perfect when you want something hearty, comforting, and guaranteed to impress guests. The combination of creamy potatoes and melted cheese creates a dish that’s both satisfying and incredibly flavorful.
Whether you’re making it for a weeknight dinner, a holiday meal, or a potluck gathering, this casserole will quickly become one of your favorite go-to side dishes.
Why You’ll Love This Recipe
There are plenty of mashed potato recipes out there, but this one stands out for several reasons:
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Ultra creamy texture thanks to butter, sour cream, and milk
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Loaded with flavor from bacon, cheddar cheese, and green onions
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Perfect for gatherings because it can feed a large group
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Make-ahead friendly, making meal prep much easier
It’s essentially the comfort food version of a loaded baked potato—but even better because every bite is packed with flavor.
Ingredients
For the mashed potatoes
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3 pounds russet potatoes, peeled and cut into chunks
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½ cup butter
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¾ cup milk (warm)
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½ cup sour cream
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1 teaspoon garlic powder
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Salt and black pepper to taste
For the loaded topping
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1½ cups shredded cheddar cheese
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6 slices bacon, cooked and crumbled
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¼ cup chopped green onions
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¼ cup sour cream (optional drizzle)
Step-by-Step Instructions
1. Cook the Potatoes
Start by placing the peeled and chopped potatoes into a large pot of salted water.
Bring the water to a boil and cook the potatoes for 15–20 minutes, or until they are fork-tender. You should be able to easily pierce them with a fork.
Drain the potatoes well and return them to the warm pot for a minute to remove excess moisture.
2. Mash the Potatoes
Add the butter to the hot potatoes and begin mashing. The heat from the potatoes will melt the butter beautifully.
Next, pour in the warm milk and add the sour cream.
Mash until the potatoes are smooth and creamy. If you prefer a rustic texture, leave a few small chunks.
Season with garlic powder, salt, and black pepper.
3. Prepare the Bacon
While the potatoes are cooking, fry the bacon in a skillet over medium heat until it becomes crispy and golden.
Place the cooked bacon on paper towels to drain excess grease, then crumble it into small pieces.
The crispy bacon will add a smoky flavor and wonderful texture to the casserole.
4. Assemble the Casserole
Preheat your oven to 375°F (190°C).
Lightly grease a 9×13-inch baking dish.
Spread the mashed potatoes evenly in the dish using a spatula.
Now it’s time for the best part—the toppings.
Sprinkle the shredded cheddar cheese evenly over the potatoes, followed by the crispy bacon crumbles.
Bake the casserole for 15–20 minutes, or until the cheese is melted and bubbly.
5. Add the Final Touches
Remove the casserole from the oven and sprinkle chopped green onions over the top.
For extra creaminess, you can add a light drizzle of sour cream before serving.
Let the casserole rest for 5 minutes before serving so it sets slightly.
Tips for the Best Loaded Mashed Potato Casserole
Use the Right Potatoes
Russet potatoes are ideal because they become fluffy when mashed. Yukon Gold potatoes also work well if you prefer a creamier texture.
Warm the Milk
Adding warm milk instead of cold milk keeps the mashed potatoes smooth and prevents them from becoming gummy.
Don’t Overmix
Overmixing mashed potatoes can make them gluey. Mash just until smooth.
Taste Before Baking
Always taste your mashed potatoes before baking and adjust salt and seasoning if needed.
Delicious Variations
One of the best things about this casserole is how easy it is to customize.
Ranch Loaded Potatoes
Add 1 tablespoon of ranch seasoning to the mashed potatoes for a tangy flavor.
Spicy Version
Mix in diced jalapeños or a pinch of cayenne pepper for heat.
Extra Cheesy
Use a blend of cheeses such as mozzarella, Monterey Jack, and cheddar.
Veggie Loaded
Add sautéed mushrooms, bell peppers, or broccoli for extra texture and nutrition.
Make-Ahead Instructions
This casserole is perfect for preparing in advance.
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Assemble the mashed potatoes and toppings in the baking dish.
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Cover tightly with foil.
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Refrigerate for up to 24 hours before baking.
When ready to bake, simply place it in the oven and cook until heated through and bubbly.
This makes it ideal for holiday meals, dinner parties, or potluck gatherings.
Storage and Reheating
Refrigerator
Store leftovers in an airtight container for up to 4 days.
Freezer
You can freeze the casserole for up to 2 months. Wrap tightly with foil and plastic wrap.
Reheating
Reheat in the oven at 350°F (175°C) for about 15–20 minutes until warmed through.
What to Serve With Loaded Mashed Potato Casserole
This dish pairs beautifully with many main courses, including:
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Roast chicken
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Grilled steak
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Meatloaf
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Baked ham
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BBQ ribs
It also works wonderfully as a hearty side dish for holiday dinners like Thanksgiving or Christmas.
Final Thoughts
Loaded Mashed Potato Casserole is the ultimate comfort food. Creamy potatoes, crispy bacon, melted cheese, and fresh green onions come together in a dish that feels both indulgent and familiar.
It’s warm, satisfying, and incredibly easy to make. Best of all, it’s a guaranteed crowd-pleaser—once you serve it, people will definitely ask for the recipe.