These Crock Pot Mashed Potatoes are creamy, delicious, and layered with the flavors of garlic, rosemary, and tangy buttermilk! They’re an easy gluten-free side dish that the entire family will love!

Crock pot mashed potatoes with buttermilk in a bowl.

Fall and cooler temperatures are here, so I’m completely in comfort food zone. The prospect of soups, chili, and cozy autumn suppers is enough to make me excited about the season.

Potatoes are one of my favorite comfort foods.  Naturally they’re great in the summertime, but I love them even more in the cold months when I crave good soul-warming food.

The most requested potato dish in my house is mashed potatoes, which is why I’ve created so many variations here on the blog.

My yukon gold mashed potatoes are my go-to recipe, but my Instant Pot mashed potatoes are even easier and require less water!

These creamy Crock Pot Mashed Potatoes are the hands off approach to our favorite side. They make my life so much easier on Thanksgiving, Christmas, and any time my family asks for them.

They’re incredibly delicious, with layers of flavor from the tangy buttermilk, garlic, and fresh rosemary. Don’t be surprised if they become your new favorite side dish. 🙂

Buttermilk mashed potatoes in the crock pot.
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Why you’ll love this recipe

  • Crock Pot mashed potatoes made with buttermilk turn out super creamy and slightly tangy.
  • This is a “set it and forget it” recipe, so it’s perfect for the holidays or busy weeknights.
  • The recipe requires just 7 basic ingredients and may be customized with your favorite milk, herbs, or spices.
  • It’s an easy side dish that’s naturally gluten-free.

Recipe ingredients

You don’t need many ingredients to make perfect mashed potatoes in the Crock Pot. I kept the ingredients list simple, yet they’re packed with flavor.

Crock Pot buttermilk mashed potatoes recipe ingredients.
  • Potatoes. I prefer using Yukon Gold potatoes to make mashed potatoes as they’re very creamy in texture. You may substitute them with russet potatoes if you don’t have any on hand.
  • Buttermilk. The buttermilk provides a nice, tangy flavor and creaminess. The buttermilk may also be substituted with heavy cream, half and half or whatever milk you have on hand.
  • Chicken stock. You may substitute vegetable stock or water to make this dish vegetarian.
  • Garlic. Cooking fresh cloves of garlic with the potatoes mellows the flavor substantially.
  • Rosemary. You may use fresh or dried rosemary, or sub with your favorite herbs.
  • Butter. I prefer using unsalted butter and then add table salt to taste.

See the recipe card below for the full list of ingredients and quantities.

How to make mashed potatoes in the Crock Pot

This buttermilk mashed potatoes recipe is about as easy as it gets. Once the potatoes have been chopped up, it’s just a matter of placing everything in the Crock Pot and walking away.

Pro tip: All slow cookers are different, so the first time you try making mashed potatoes in your slow cooker you should keep a close eye on them. I suggest checking for doneness after 3 hours on low and even stirring them occasionally. Also, add a bit more liquid if it evaporates too quickly.

See the recipe card below for full instructions.

Collage showing how to make mashed potatoes in the crock pot.
  1. Grease your slow cooker with cooking spray.  Place the peeled and chopped potatoes, stock, garlic, and salt into the slow cooker and stir.
  2. Cook on low for about 4-6 hours or until tender.
  3. Add the warmed buttermilk slowly, followed by the butter and rosemary.
  4. Mash with a potato masher until the potatoes reach the desired consistency, then season with salt and pepper, to taste. 
Buttermilk mashed potatoes in crock pot insert with rosemary and butter.

Recipe FAQs

What are the best potatoes for Crock Pot mashed potatoes?

The potatoes in the photo above are yukon gold potatoes, which are the only variety that I use for mashed potatoes.

You can certainly use russets, but if you’ve never tried yukon golds I encourage you to do so. They have a wonderful creamy texture that makes the best mashed potatoes!

Can this recipe be prepared in advance?

Yes! To prepare make ahead mashed potatoes in a Crock Pot, prepare them up to a few hours in advance. Keep them on the “warm” setting, and do keep a close eye on them to prevent burning as all slow cooker temperatures vary.

Should mashed potatoes be slow cooked on low or high?

I’ve only cooked my potatoes on low and wouldn’t advise cooking them over high heat unless you’re prepared to check them often to prevent scorching.

Why does the buttermilk need to be warmed before being added to the potatoes?

Warming the buttermilk prior to adding to the hot potatoes helps to prevent curdling. You want the buttermilk to be a bit warmer than lukewarm, but not hot.

What to serve with this recipe

These slow cooked buttermilk mashed potatoes are extremely versatile and pair well with your favorite weeknight dinners or holiday recipes.

Recipe notes

  • Pro tip: All slow cookers are different, so the first time you try making mashed potatoes in your slow cooker you should keep a close eye on them. I suggest checking for doneness after 3 hours on low and even stirring them occasionally. Also, add a bit more liquid if it evaporates too quickly.
  • No buttermilk? It’s easy to make your own! Simply add a tablespoon of fresh lemon juice to regular milk and let stand for 10 minutes, or sub with whole milk, half and half or heavy cream.
  • Customize these Crock Pot buttermilk mashed potatoes by adding your favorite herbs and spices.
  • Note that this recipe calls for a 6-quart Crock Pot. You can make this recipe with a larger Crock Pot, but do not try to fit the potatoes into a smaller one.
Buttermilk mashed potatoes in a white bowl.

Did you try this recipe?  If so, be sure to leave a review below and tag me @flavorthemoments on Facebook and Instagram

Crock pot mashed potatoes with buttermilk in a bowl.

Crock Pot Mashed Potatoes

These Crock Pot Mashed Potatoes are creamy, delicious, and layered with the flavors of garlic, rosemary, and tangy buttermilk! They're an easy gluten-free side dish that the entire family will love!
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Ingredients

  • 3 lbs. yukon gold potatoes peeled and chopped into 1″ cubes
  • 3/4 cup low sodium chicken stock may substitute with vegetable stock or water
  • 3 cloves garlic smashed
  • 1 teaspoon salt plus more to taste
  • 1 1/4 cup buttermilk warmed slightly (not hot) (I used 1 1/4 cups)
  • 4 tablespoons unsalted butter softened
  • 1 tablespoon freshly chopped rosemary or 1 teaspoon dried

Instructions 

  • Grease your slow cooker with cooking spray.  Place the potatoes, stock, garlic, and salt into the slow cooker and stir. Cook on low for about 4-6 hours or until tender.
    3 lbs. yukon gold potatoes, 3/4 cup low sodium chicken stock, 3 cloves garlic, 1 teaspoon salt
  • Add the warmed buttermilk slowly, followed by the butter and rosemary, and mash with a potato masher until the potatoes reach the desired consistency.  Season with salt and pepper to taste.
    1 1/4 cup buttermilk, 4 tablespoons unsalted butter, 1 tablespoon freshly chopped rosemary
  • Serve immediately or keep on warm in the slow cooker until ready to serve.  Enjoy!

Notes

  • Pro tip: All slow cookers are different, so the first time you try making mashed potatoes in your slow cooker you should keep a close eye on them.  I suggest checking for doneness after 3 hours on low and even stirring them occasionally.  Also, add a bit more liquid if it evaporates too quickly.
  • I’ve only cooked my potatoes on low and wouldn’t advise cooking them over high heat unless you’re prepared to check them often to prevent scorching.
  • Warm the buttermilk prior to adding to the hot potatoes to prevent curdling.  It should be a bit warmer than lukewarm, not hot.
  • No buttermilk? It’s easy to make your own! Simply add a tablespoon of fresh lemon juice to regular milk and let stand for 10 minutes, or sub with whole milk, half and half or heavy cream.
  • Customize these buttermilk mashed potatoes by adding your favorite herbs and spices.

Nutrition

Calories: 305kcal, Carbohydrates: 51g, Protein: 8g, Fat: 9g, Saturated Fat: 5g, Polyunsaturated Fat: 3g, Cholesterol: 22mg, Sodium: 603mg, Fiber: 5g, Sugar: 5g

Nutrition is estimated using a food database and is only intended to be used as a guideline for informational purposes.

Did you try this recipe?Be sure to tag @flavorthemoments with the hashtag #flavorthemoments on Instagram so I can see what you made!

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