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My go-to, make-ahead Crockpot Cheesy Mashed Potatoes with Caramelized Onions. Made simply and easily in the crockpot with cream, salted butter, onions, and melty Gruyere cheese. Each bite is perfectly smooth, creamy, and so delicious. This method makes for the creamiest and most flavorful mashed potatoes. You can make these in the crockpot, instant pot, or on the stove. They’re perfect for making ahead of time for easy entertaining!
I just could not do Thanksgiving without perfect mashed potatoes. After all, they’re everyone’s favorite side dish, right? My brothers are mashed potato fanatics. They say the only reason they love turkey and gravy is thanks to the forkful of mashers they add with each bite.
And while I definitely have other mashed potato recipes on the site, this is the family favorite. The crew really loves a cheesy, buttery potato with just the right amounts of onions. Not overpowering, but just right.
These are their perfect potatoes. I think I got the ratios just right! They’re now labeled as “fire” mashed potatoes.
Clearly, we love these potatoes.
After many years of trying all the ways to cook my mashed potatoes, I’ve decided that using the crockpot is my favorite. When in a time crunch, I use the instant pot or stove, but the crockpot is my ideal cooker.
I do mine a little differently than most.
Most recipes for potatoes in the crockpot don’t have you cook the potatoes in water, then drain. They’ll tell you to cook in milk or broth. But I just don’t find that to work as well.
I add the potatoes to the crockpot, add water, add garlic, and salt, then cover and let them slow cook for a few hours or up to all day.
Once the potatoes are fork-tender, I drain them and add them back to the dry, but still hot crockpot bowl. I set the crockpot to low, then cook onions. The key is to allow the potatoes to sit in the hot crockpot to dry off. Reducing the moisture gives you even creamy, tastier potatoes!
While the potatoes sit, I make the onions.
A lot of mashed potato recipes call for onion powder. But I wanted to add a little more of a fresh onion flavor that wasn’t overpowering, but just right.
I love using caramelized onions for an onion flavor that’s more mellow.
I first caramelize them down in a bit of butter. Then I like to add some wine to help them caramelize a little faster. Next, just a little fresh thyme, sage, salt, and pepper. Plus lots of butter, which is key for any good potato dish.
When it comes to mashing the potatoes, I don’t do anything fancy, just mash them with a masher and call it a day. But you do you, if you love a super smooth, whipped potato, try using a potato ricer instead.
Once I have the potatoes mashed, I add cream, sour cheese, the carmelized onions, butter and melty gruyere cheese. Continue letting the potatoes cook until the cheese is melted. And that’s it, you’ll have the most perfect, flavorful, and creamiest mashed potatoes.
Classic, but with amazing flavor and cheesiness.
Serve these up warm with a little added sage for color.
I’m excited to not only share this recipe with you guys but also with family and friends. My brothers have all agreed, these are one of their favorite potato dishes.
When you win over the brothers, all is good!
The next question is, what will you be pairing these cheesy potatoes with? The obvious answer for Thanksgiving is turkey. But come December, over here it will be my roasted beef tenderloin.
Looking for other easy Thanksgiving sides?? Here are my favorites:
Crispy Parmesan Thyme Sweet Potato Stacks
Sweet Potato Casserole with Sweet ‘n’ Savory Bacon Pecans
Easiest No-Boil Brie Mac and Cheese
Lastly, if you make these Crockpot Cheesy Mashed Potatoes with Caramelized Onions, be sure to leave a comment and/or give this recipe a rating! Above all, I love to hear from you guys and always do my best to respond to each and every comment. And of course, if you do make this recipe, don’t forget to tag me on Instagram! Looking through the photos of recipes you all have made is my favorite!
Nutritional information is only an estimate. The accuracy of the nutritional information for any recipe on this site is not guaranteed.
Family Favorite 😍
Hey Megan,
Wonderful!! Thanks so much for giving this recipe a try, I love to hear that it was enjoyed! Thanks for your comment! xx
I doubled the recipe and made these in the crockpot for a holiday dinner for 40 people. They were absolutely amazing! I made them ahead of time and kept them hot in the crockpot for about an hour before serving. They received a lot of compliments, and multiple people asked for the recipe. One of my guests made them for their own Christmas dinner and also earned rave reviews. I’m making them again today for another holiday dinner because they were just so good. Thank you for the delicious recipe!
Hey Lisa,
Happy Wednesday!!🎇 I am delighted to hear that this recipe was enjoyed and appreciate you making it! xx
These were incredible and had so much flavor! Everyone at our Christmas Eve dinner was raving, thank you for such a great recipe that was so simple and so delicious!
Hey Susan,
Happy Monday!❄️ I am so glad to hear that this recipe was enjoyed, thanks a lot for making it! xx
These are positively bitchin. So dang good.
Hey Emilie,
I appreciate you making this recipe and sharing your review, I am so glad to hear it was enjoyed! Merry Christmas! 🎁🎄
Made these for Thanksgiving, they were out of this world! Such a fan favorite, I’m making again for Christmas dinner. SO GOOD!!!
Hi Christine,
I appreciate you making this recipe and sharing your review, I am so glad to hear it was enjoyed! Merry Christmas! 🎁🎄
Hello! Very excited to try this out. What’s the best substitute for the 1/4 cup of dry white wine? Thanks so much!
Hey there, you can use chicken broth in place of the wine! Let me know how this recipe turns out for you, I hope it’s delish! xT
I am so excited to be making these for Christmas this weekend. If I were to make them Saturday, could I keep in the crockpot, store in fridge and rewarm the next day and add more cream as needed? Would that change any of the taste?
Hey Brittany,
That would be just fine for you to do! Let me know how this recipe turns out, I hope you love it! xT
My potatoes were starting to discolour in the crockpot because they’re not all covered in water. I just transferred them to a pot and covered them fully with water to cook. Is that supposed to happen and would they have been ok? I liked the crockpot idea…
Hi Susan,
Thanks for giving this recipe a try! How far in advance did you cut your potatoes? They definitely shouldn’t be discolored, so strange! Let me know how I can help!! xx
These are seriously the best. Letting them dry out in the crockpot makes all the difference & the onions make them so so tasty!!
Hey Molly,
Perfect!! ⛄️ I love to hear that this recipe was a winner, thanks so much for trying it out! xx
Question, I am planning on trying these in the instant pot this weekend. Steps 5 in both the instructions for a crock pot and an instant pot are exactly the same. Is it to be understood to put the cream and cheese into the instant pot with everything else for the final 15 minutes?
Hi Daniel,
Correct, you can follow the directions exactly as written:) Please let me know if you have any other questions! xT
Can you make these a day before and add more cream when warming them?
Hey Sherry,
You bet, that will work well for you! Please let me know if you have any other questions! xT
Rich and Delicious! I could almost eat this on its own!
Hey Lorena,
Awesome!! Thanks so much for making this recipe and sharing your review! Love to hear that it was enjoyed! Happy Sunday!🎄
If I were to double the recipe, would that fit in a standard crockpot? Mine is 6.5 qts.
Hey Stefanie,
I don’t think the pot will be large enough to double. So sorry! Please let me know if you have any other questions! xx
Hi! Do you peel your potatoes?
Hi Andrea,
Yes, the recipe calls for the potatoes to be peeled and quartered. Please let me know if you have any other questions, I hope you love this recipe! xT
I made these tonight and they paired great with my meatloaf! Everyone loved them. However, even though they tasted great, they ended up being pretty thick and kind of gooey. Any suggestions on what I did wrong?
Hey Holly,
Wonderful!!🎄 I love to hear that this recipe was a winner, thanks so much for making it and sharing your review! Did you need more cream or milk? Were they over-mixed? xx