Loaded Mashed Potato Casserole (Leftover Recipe)
Looking for a leftover mashed potato recipe? This Loaded Mashed Potato Casserole is the most delicious way to use up leftover mashed potatoes. It’s loaded with bacon, cheese and sour cream!
Thanksgiving is one of my favorite holidays, but with a gathering of just five people, we’re often stuck with quite a bit of leftovers after the big meal.
I’m prepared for the fact that even the smallest Cajun turkey will have us eating turkey sandwiches for several days. And leftover baked ham with pineapple sauce can always turn into ham and bean soup.
And for some reason, I find it impossible to make a small batch of mashed potatoes. Even when I limit it to one small potato per person, somehow once they’re all mashed up, I have enough to serve an army (which is why sometimes I just serve a few mini Hasselback potatoes per person instead).
Then the question becomes, what to do with leftover mashed potatoes?
While you can simply reheat leftover mashed potatoes and drizzle them with homemade gravy a second time around, use them on top of mini shepherd’s pie, or even make potato cakes, my favorite way to serve leftover mashed potatoes a second time is this Loaded Mashed Potato Casserole.
How long are leftover mashed potatoes good for in the fridge?
As long as they are refrigerated promptly (no more than 2 hours after serving) and covered tightly, mashed potatoes from your holiday dinner will last about 3 or 4 days. This gives you plenty of time to gather the ingredients and make these loaded mashed potatoes.
What to do with leftover mashed potatoes:
The easiest way to reheat mashed potatoes is to simply spread them in a buttered casserole dish, cover them with foil, and bake at 350 degrees F until they are completely heated through. Thanksgiving rice is also great reheated this way.
But why not add some extra flavor before you reheat? That’s where this loaded mashed potato casserole recipe comes in.
What you’ll need for this loaded mashed potato casserole:
- mashed potatoes – use whatever type of mashed potatoes you have on hand for this leftover mashed potato recipe. I usually make Greek yogurt mashed potatoes for Thanksgiving, and use the leftovers here.
- sour cream – this adds some moisture back into the mashed potatoes, which tend to dry out when they’re heated up a second time.
- garlic powder – I normally use fresh garlic for just about everything, but I actually love the flavor of garlic powder in mashed potatoes!
- sharp cheddar cheese – because they’re not LOADED mashed potatoes unless we add cheese! You can use any type of cheese you want.
- bacon – make a quick batch of oven baked bacon and crumble it up (save the grease for bacon grease gravy). If turkey bacon is more your speed, check out my tutorials on how to cook turkey bacon in the oven and turkey bacon in an air fryer!
- red onion – I add quite a bit of onion to this loaded mashed potato casserole for added flavor. You can also use white or yellow onion.
- green onion – yes, a second type of onion! I like to add these for color.
- parsley – this is mainly for color, but you can skip it if you don’t have any on hand.
- cheese crackers – I love adding crushed cheese crackers (like Cheez-Its or Goldfish) to the top of this leftover mashed potato casserole for a bit of crunch. You can also use Ritz crackers or potato chips!
- butter – tossing the crackers in a bit of melted butter ensures they’ll get nice and golden brown on top of the casserole.
Tips for making this leftover mashed potato recipe successful:
This recipe works great with leftover mashed potatoes (or even leftover blue cheese mashed potatoes), but you can also make it starting with fresh mashed potatoes (i.e. make mashed potatoes specifically in order to make this recipe).
If using leftover mashed potatoes, the potatoes do need to be slightly warmed before stirring in the other ingredients.
Cold mashed potatoes are very hard to stir and incorporate with the other ingredients. Trust me, just warm them up a little and it will be so much easier.
These baked mashed potatoes are very adaptable to your family’s preferences and whatever ingredients you happen to have on hand.
Omit the bacon for a vegetarian loaded mashed potato casserole. Use chives instead of parsley. You can even use Parmesan cheese instead of cheddar in this leftover mashed potato recipe.
I love a scoop of this loaded mashed potatoes recipe alongside a helping of leftover Thanksgiving salad or Christmas salad.
Can I freeze this loaded mashed potatoes casserole?
If you make these loaded mashed potatoes using leftover mashed potatoes, I do NOT advise freezing it and reheating it again.
As a general rule of thumb for food safety, you only want to reheat leftovers once. Anything left over after that, you should discard.
However, if you make this recipe using “fresh” mashed potatoes (mashed potatoes you made immediately before making this casserole), you can freeze it.
Bake the frozen casserole straight from the freezer at 350 degrees F until the internal temperature of the casserole reaches at least 165 degrees F.
Psst – if you love the flavors in this loaded mashed potatoes recipe, you will also like my baked potato pizza!
More recipes that use up holiday leftovers:
Leftovers don’t have to be boring! Jazz things up with these easy recipes.
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Loaded Mashed Potato Bake (Leftover Mashed Potato Recipe)
Looking for a leftover mashed potato recipe? This Loaded Mashed Potato Casserole is the most delicious way to use up leftover mashed potatoes. It's loaded with bacon, cheese and sour cream!
- Nonstick cooking spray
- 1/2 cup coarsely crushed cheese crackers
- 2 tablespoons unsalted butter, melted
- 4 cups mashed potatoes
- 1/2 cup sour cream
- 1/2 teaspoon garlic powder
- 1/2 teaspoon ground black pepper
- 6 slices oven baked bacon, crumbled
- 8 ounces shredded sharp cheddar cheese
- 1/2 cup finely chopped red onion
- 3 tablespoons thinly sliced green onion or chives
- 2 tablespoons chopped fresh parsley
- Preheat oven to 350 degrees F. Spray large casserole dish with nonstick spray. In small bowl, stir crackers and butter until well combined.
- If mashed potatoes are cold, place in a large microwave-safe bowl and microwave 60 to 90 seconds to soften. Add sour cream, garlic powder and pepper to potatoes; stir until well combined.
- Reserve 2 tablespoons each bacon and cheese. Add red onion, green onion, parsley and remaining bacon and cheese to potatoes; stir until well combined.
- Transfer mixture to prepared casserole dish and sprinkle with cracker mixture and reserved bacon and cheese. Bake 25 to 30 minutes or until heated through.
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Nutrition Information:Yield: 6 Serving Size: 1
Amount Per Serving: Calories: 477Total Fat: 32gSaturated Fat: 14gTrans Fat: 1gUnsaturated Fat: 13gCholesterol: 72mgSodium: 966mgCarbohydrates: 31gFiber: 3gSugar: 4gProtein: 17g
This website provides estimated nutrition information as a courtesy only. You should calculate the nutritional information with the actual ingredients used in your recipe using your preferred nutrition calculator.
Note: This loaded mashed potatoes recipe was originally published in 2013. The recipe was updated in 2022 to be even better, the photos were reshot, and the post was revised accordingly. The original photo appears below.
This recipient is a winner! Easy to improvise if needed.. I made it yesterday and it turned out to be melt in.your mouth, delicious and memorable.
For me I used chicken broth vs. water in the potatoes when I made them earlier.. And instead of sour cream (which I used for this recipe previously) I used half heavy cream and half whole milk. To reheat the potatoes prior to cooking (excellent suggestion!) I moistened them with a tad heavy cream.
Absolutely perfect way to use up leftovers!
Love to hear a recipe is memorable, Melinda. That’s exactly what I’m going for. Thank you for stopping by to let me know.
Great recipe! We had lots of left over mashed potatoes when our family was here for “Thanksgiving in July” I found this recipe while looking for what to do with all the leftovers.
The only think I changed was using Ritz crackers on top since I didn’t have any other the others.
We will make this again for sure!
I’m so glad to hear you liked this, Cherilyn. I use Ritz crackers for this all the time, too.
What can be used in a pinch for the cheese crackers?
Do you have potato chips?
I’m sorry for not following your recipe , but I used as my base. I can’t leave anything alone which my wife says is a curse but it usually works
I had corn left over and I figured a cup of hamburger would satisfy my curiosity
Well it all worked out and the wife enjoyed it. Between both of us ate most of an 9×9 dish
Thank you for the base ideas
That’s exactly how I am with other recipes, Reggie! I’m a big fan of just playing around and using what you have on hand to make it your own. I am so glad you liked your finished dish. Happy New Year!
I actually made this last weekend and it was AMAZING!!!! Probably the best mashed potato recipe I’ve ever had. I had made Ina Garten’s parmesan smashed potatoes on Thanksgiving so used those to make this recipe – since they already were well seasoned with parmesan and salt I was actually concerned the final dish would be too salty, but it was F-A-B-U-L-O-U-S. The husband loved it too! I used the Aldi Savoritz kids cheese crackers (I think they’re like Pepperidge Farm Goldfish) for the topping. I will be making this again on Christmas Eve to serve with pulled pork sliders.
I am so glad to hear that, Tina. And you can just never go wrong when you start with an Ina recipe – she’s the queen!
You are right about Ina. However – I do think your mashed potato recipe is the best. My husband just requested it for tomorrow night’s dinner too! 😉
I have made these many times in the past. A personal favorite, but never tried with the cheese crackers. Sounds good!
Thanks for stopping by, Rhonda! The cheese crackers might be my favorite part. I put crushed-up Goldfish crackers on top of my homemade mac and cheese, too 🙂
Would this. Go good to put cut up pieces of pork loin inside the bake
Sounds good to me!
I dont see anyone that has made this dish so i will make it and leave feedback about it..I was hoping someone had made it so i know if i should add more this or less that..But I will get back asap…Sounds easy and filling to make…ty
Hope you love it, Mary!
Um, yes please! I can practically taste this already. It must smell divine coming out of the oven.
Thanks so much, Laura!
Hi! I love this recipe and want to use it for our big family Thanksgiving. Any suggestions for modifying this recipe to feed 30 to 40 people?
Hi Joy! So glad you like the recipe, and I hope it’s a hit for you at Thanksgiving. I’ve definitely never made it in that kind of quantity, but you should be able to multiply the recipe by any factor you need to to make sure you have enough (and just let me know if you need help scaling the recipe). Also – you can prep this in 2-3 days advance! Just cover and refrigerate, and bake when you’re ready to serve.
I also have an easy method for making a large quantity of bacon. This might help 🙂 https://foxeslovelemons.com/culinary-school-lesson-bakin-bacon
Let me know if you have any questions as you work on it. I hope you have a great Thanksgiving!
Hi Lori, just had this alongside a baked chicken recipe and salad. It was so good. I did though, have to guess when to add in the prepared chesse crackers in the directions. Thank you for sharing 🙂
Oh my gosh, Esther, I skipped a step when writing up the directions! Thanks so much for pointing it out – going in to correct it now. The crackers are sprinkled on top with the rest of the reserved goodies 🙂
No matter where you ended up putting the crackers in, I’m so glad you enjoyed this recipe!
I love this recipe, I have a similar one, it’s the bomb!! Isn’t it nice doing what we love? Happy belated Thanksgiving. 🙂
Everything I LOVE in a dish!
I’m still trying to figure it all out, Lori, and I definitely have you as an inspiration. I just wrote a super angsty post about whether I should stay in my stable full time job or say t’hell with it and go do something crazy but fun and potentially totally fulfilling. Sigh. I’ll just have to make pans ‘n pans of this ridiculously delicious mashed potato bake to stuff my face while I’m mulling over my life choices!
I like the cracker idea, cheesy, salty, bacon ummmm!
Bring on the Thanksgiving pants and park this dish right in front of me. Wow it looks so good. I mean really good. Incredibly comfort-in-my-tummy good.
I think this would be one of those dishes where I would stand with a wooden spoon ready to smack the hand of anyone who tried to get any of it.
Yes. That’s all I have to say, okay and please may I have some?
Lori, I absolutely LOVE dishes like this! either using leftovers or throwing all sorts of deliciousness together. and it has all of my favorite things!!! looks delicious! I hope you have a wonderful Thanksgiving!
Oh, man, my family would go nuts for this potato casserole! So much better than ordinary sweet potatoes! Happy Thanksgiving, my friend!
Wow what a fantastic loaded potato bake. It sounds and looks fantastic!
Happy Thanksgiving to you and yours!!!
Yum, yum, yum, yum, yum!!!! This looks incredible! My Husband would love it if I made a dish like this for him!!
I know we’ll have some mashed potatoes left over this week so I cannot wait to try this recipe!
Pass the bowl, and you might not get it back! These sound amazing!
Bahaha, I quote Friends OFTEN, and we celebrated Thanksgiving #1 today and I referenced the sweat pants line, myself. I love this dish, p.s.!
This is crazy pants, and I love it! I don’t usually go for mashed potatoes, but that’s obviously because I’ve been doing it wrong my whole life.
Oh my goodness this is a loaded mashed potato bake…which is super duper delicious looking and sounding! Congratulations, Lori, on all your well deserved success =)
I am not only thankful for the potatoes, bacon, sour cream, cheese but oh those crushed up cheese crackers have me over the edge!!
A gorgeous recipe to celebrate finding your passion Lori! For that is one of the things that will always make life enjoyable. Love the idea of baking the mashed potato as a casserole!
I could eat these once a week and never get tired of them!
This is so perfect for meals even beyond Thanksgiving. Such a crowd pleaser!
Loaded is right, totally delicious. I would love a bowlful right now. Crushed cheese crackers, yum, love Cheez its, I could eat a whole box.
I loved that Friends episode, Lori! It’s one of my favorites. And your loaded mashed potatoes would be most welcome on my table!
How many people can say they have their dream job? You are truly living the dream!
My husband prefers roasted potato over mashed. He says mashed are so boring, but I but if I served up these he would be won over.