This make ahead loaded mashed potato casserole is full of bacon, cheese, sour cream and chives – it’s the perfect no-fuss side dish for a holiday meal.

These mashed potatoes have all the flavors of a fully loaded baked potato in the form of an easy to make casserole. I serve this dish every year for Thanksgiving and it always gets rave reviews!

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Loaded mashed potato casserole topped with melted cheese, bacon and herbs.

In my family I am always put on mashed potato duty. I’ve made them so many times that I have it down to an exact science. But sometimes I want something a little more interesting than your standard mashed potatoes. This loaded mashed potato casserole jazzes up plain potatoes by adding everyone’s favorite baked potato toppings to the mix.  Best of all, you can make the entire casserole a day in advance and just pop it in the oven to bake before it’s time to eat.

How do you make mashed potato casserole?

The first step is to cook your potatoes. I boil my potatoes until they’re tender, then mash them up with plenty of butter, cheese, sour cream and seasonings. Afterwards, the mashed potatoes get spread into a casserole dish and then are topped with bacon and cheese and baked to perfection.

Potatoes, sour cream, cheese and seasonings in a bowl.

The base of this casserole is sour cream mashed potatoes. Everyone seems to have preferences in terms of how they mash their spuds – some people like it chunky, others like it smooth. I prefer a smoother potato and I use a ricer to make sure there are no lumps left behind. If you don’t have a ricer, not a problem – this recipe also works with a traditional potato masher or you can even use your mixer (but never the food processor)!

Mashed potatoes in a baking dish.

What I love about this mashed potato casserole is that it’s SO easy to make in advance! Simply mash your potatoes, put them in your casserole dish, and cover until you’re ready to bake. Right before the potatoes go into the oven, add the cheddar cheese. If you’re starting from a cold casserole, you’ll want to add about 10-15 minutes to the bake time.

Mashed potatoes in a casserole dish, topped with shredded cheese.

I add a sprinkling of bacon towards the end of the cook time, simply because I don’t want the bacon to burn before the potatoes are heated through. I top my loaded mashed potatoes with a sprinkling of chives and parsley for a fresh note.

A casserole of loaded mashed potatoes topped with cheddar cheese, crispy bacon and chives.

There are so many different ways to customize this mashed potato casserole to your liking. Here are some other great flavor additions

  • Jalapenos
  • Tomatoes
  • French fried onions
  • Minced garlic
  • Cream cheese

These mashed potatoes are on our table for every holiday, and there are never any leftovers. You definitely can’t argue with that kind of success!

A dish of loaded mashed potato casserole with a serving spoon in it.

More potato recipes you’ll love

Loaded Mashed Potato Casserole Video

5 from 44 votes

Loaded Mashed Potato Casserole

AuthorSara Welch
Loaded mashed potato casserole topped with melted cheese, bacon and herbs.
This make ahead loaded mashed potato casserole is full of bacon, cheese, sour cream and chives - it's the perfect no-fuss side dish for a holiday meal.
Prep Time20 minutes
Cook Time40 minutes
Total Time1 hour
Course Side Dish
Cuisine American
Serves 6 servings


  • 3 pounds of russet potatoes , peeled and cut into 1 and 1/2 inch pieces
  • 3/4 cup of milk (I used 1%)
  • 4 tablespoons of butter , melted
  • 1 cup of sour cream
  • kosher salt and pepper to taste
  • 1 2/3 cups of shredded cheddar cheese , divided use
  • 1/2 cup crumbled cooked bacon
  • 1/4 cup finely chopped chives
  • 2 tablespoons finely chopped parsley
  • Cooking spray


  • Bring a large pot of water to a boil; add 2 tablespoons of salt. Place the potatoes in the pot and boil for 15-20 minutes or until potatoes are tender.
  • Drain the potatoes. Run the potatoes through the ricer and transfer them back to the pot. Alternatively you can skip the ricing step and simply mash the potatoes with a potato masher or mixer. 
  • Stir in the milk, butter, sour cream and then add salt and pepper to taste. Stir in 1 cup of the cheddar cheese.
  • Preheat the oven to 350 degrees F. Place the potatoes into a 9 inch square pan or 2 quart casserole dish. coated with cooking spray. Top with remaining 2/3 cup of cheddar cheese. 
  • Cover the pan with foil and place into the oven. Bake for 20 minutes. Remove the foil and add the bacon; bake, uncovered for an additional 20 minutes or until cheese is bubbly and potatoes are heated through. 
  • Sprinkle the chives and parsley over the top and serve immediately.


Make Ahead: Place the prepared mashed potatoes in the baking pan and top with cheese. Cover and place in the fridge for up to 24 hours. Proceed with the rest of the recipe instructions when you're ready to bake it.


Calories: 462kcal | Carbohydrates: 31g | Protein: 18g | Fat: 30g | Saturated Fat: 17g | Cholesterol: 85mg | Sodium: 490mg | Potassium: 1116mg | Fiber: 5g | Sugar: 2g | Vitamin A: 1020IU | Vitamin C: 29mg | Calcium: 375mg | Iron: 7.8mg

This post was originally published on November 24, 2015 and was updated on August 12, 2018 with new content.

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Recipe Rating


  1. Do you cook the bacon fully before putting it in the oven for 20 minutes? Bacon doesn’t get too crispy?

  2. Sounds delicious! I want to make this for Christmas. Can I sub yogurt or cream cheese for the sour cream. I have a picky eater.

  3. 5 stars
    Absolutely delicious! We made this for Thanksgiving and it is definitely a keeper. I couldn’t find vegan bacon where we were so we used vegan chorizo crumbles instead. Will be making it the same way again for Christmas for many non-vegans.
    Thank you so much!

  4. 5 stars
    I am making this today for Thanksgiving. It hasn’t gone in the oven yet but from tasting I did while putting it together it’s going to be delicious!!

  5. 5 stars
    We have made this recipe on many occasions for our family gatherings and they are always a hit. So easy to make and can always add a little twist to change it up. Just received a text from a friend whom I made a meal for and the Loaded Mashed Potato Casserole was part of the meal. She said everyone raved about them and wanted the recipe. Thank you much. Blessings.

    1. You can double it if you’re looking to feed more people, otherwise just spread it into a thinner layer and bake for less time.