Sweet Potato Sugar Cookies with Fluffy Marshmallow Icing

This post is sponsored by Imperial SugarDixie Crystals and Bob’s Red Mill. I received free product as a part of The Sweetest Season Cookie Exchange. As always, all opinions, thoughts and recipes are my own.

These Sweet Potato Sugar Cookies with Fluffy Marshmallow Icing sing of the holidays. The cookies’ light sweet potato and cinnamon flavors pair beautifully with the marshmallow icing, turning the seasonal favorite Sweet Potato Casserole into a dessert!

Christmas shaped cookies on christmas platter

Christmas shaped cookies on christmas platter

When I was plotting out my final cookie recipe for The Sweetest Season, I knew I wanted to do something different. And I was inspired one evening when I was baking several pounds of sweet potatoes for my daughter.

Yes, I know. I’m that mom who makes her baby’s food. Since I work from home, I’m able to take the time to roast veggies and blend fruits so I can know what I’m feeding her during most meals.


I was roasting sweet potatoes and got curious…

Close up of christmas shaped cookie on christmas platter

Sweet potatoes are delicious in biscuits.

Would they be good in cookies, too?

Overhead view of sweet potato sugar cookies on christmas platter

A lot of my recipes come from a simple question like that.

Sometimes, they work. Other times, they fail. Even more often, they need some assistance before they’re a resounding success.

These cookies?

Resounding success on the first try. Which is super rare when it comes to me and baking because it’s such a science!

Sweet potato sugar cookies on christmas platter

It was actually the icing that tripped me up.

I knew I wanted to use marshmallow to make a sweet potato casserole-esque topping… except I tried to melt marshmallows in a pan to create the base of my icing, and it ended up turning into weird marshmallow caramel. Which tasted good, but got awkwardly crunchy on these soft cookies, which did not work at all.

So it was back to the drawing board until I figured out how to make fluffy marshmallow icing.

Close up of sweet potato sugar cookie on christmas platter

It didn’t take too long.

And once the marshmallow icing was finally made, I iced the cookies. My nanny was here, and she wholeheartidly agreed with the recipe. So did my husband, who came home a short while later. And so did I.

In fairness, I’m sure my daughter and dog would’ve agreed on the flavor and texture of the cookie/icing combination, but neither were offered a bite.

The cookies are light and fluffy and not too sweet. In fact, they don’t taste very sweet at all. There’s hint of the sweet potatoes and spice. It’s not overwhelming, and they are incredibly easy to eat.

The marshmallow fluff icing is sticky and perfect without being saccharine.

My advice? Ice the cookies right before you eat them, then devour. And store the rest of the fluff in your fridge for future icings (or to use on other things because we all need marshmallow goodness in our lives.)

Here’s how ya do it:

Overhead view of sweet potato sugar cookies on christmas platter
Yield: 5 dozen cookies

Sweet Potato Sugar Cookies with Fluffy Marshmallow Icing

Prep Time: 20 minutes
Cook Time: 10 minutes
Total Time: 30 minutes

These Sweet Potato Sugar Cookies with Fluffy Marshmallow Icing sing of the holidays. The cookies' light sweet potato and cinnamon flavors pair beautifully with the marshmallow icing, turning the seasonal favorite Sweet Potato Casserole into a dessert!


Sweet Potato Cookies

  • 6 tablespoons unsalted butter, softened
  • ½ cup sweet potato puree
  • ¾ cup granulated sugar
  • ¾ teaspoon pure vanilla extract
  • 1 egg
  • 4 tablespoons apple cider
  • 1 tablespoon white vinegar
  • 2 ½ cups unbleached all-purpose flour
  • 1 ½ teaspoons baking powder
  • 1 teaspoon baking soda
  • ½ teaspoon kosher salt
  • ½ teaspoon ground cinnamon

Fluffy Marshmallow Icing

  • 1 egg white, at room temperature
  • ¾ cup light corn syrup
  • ¼ teaspoon cream of tartar
  • ¼ teaspoon kosher salt
  • ¾ cup powdered sugar
  • 2 teaspoons pure vanilla extract


Prepare the Sweet Potato Cookie Dough

  1. Combine the butter and sweet potato puree in a large bowl, beating together with a hand or stand mixer.
  2. Add the sugar, vanilla extract, egg, apple cider and white vinegar, mixing until well combined.
  3. Sift dry ingredients together into another bowl - flour, baking powder, baking soda, salt and cinnamon - and whisk together.
  4. Fold dry ingredients into the wet ingredients, stirring until just combined. The dough should be somewhat sticky, but not so sticky that it will be hard to work with.
  5. Divide the dough into two rounds, and wrap in plastic wrap. Transfer to the refrigerator.
  6. Let the dough chill in refrigerator for 2-3 hours.

Prepare the Fluffy Marshmallow Icing

  1. In a large clean bowl, beat the egg white, corn syrup, cream of tartar and salt together on high speed. The mixture will thicken and nearly double in volume in about five minutes.
  2. Reduce to mixer speed when the mixture has thickened like this, an mix in the powdered sugar and vanilla extract.
  3. Beat until the ingredients are thoroughly combined and thick.
  4. Cover, and transfer to the refrigerator until it is time to ice the cookies.

Bake the cookies

  1. Preheat the oven to 350°F. Line a large baking sheet with parchment paper, and set aside.
  2. Roll the dough on a well-floured surface into ½" thickness, then cut into desired shapes using cookie cutters.
  3. Transfer the cookies onto the prepared baking sheet.
  4. Bake for 10-12 minutes, or until cookies have cooked through and have firmed up. You do not want them to brown, so please keep an eye on them.
  5. Let the cookies cool on a wire cooling rack.

Ice the cookies

  1. Once the cookies are cool, ice with Fluffy Marshmallow Icing, and enjoy!
  2. Unless you're planning on eating the entire batch in one sitting, ice the cookies as you go, as the icing can soak into them and make them even softer. (Unless, of course, you like that kind of thing!)


Please note that the total time does not include chilling time, which is at least 2-3 hours.

Sweet Potato Cookies adapted from my Tea Cakes.

Fluffy Marshmallow Icing adapted from here. Icing can be kept in the refrigerator for up to two weeks in a sealed container.

Nutrition Information:


60 cookies

Serving Size:

1 cookie

Amount Per Serving: Calories: 61Total Fat: 1gSaturated Fat: 1gTrans Fat: 0gUnsaturated Fat: 0gCholesterol: 6mgSodium: 65mgCarbohydrates: 12gFiber: 0gSugar: 7gProtein: 1g

Nutrition facts are an estimate and not guaranteed to be accurate.

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What do you think about this flavor combination in a cookie?

Want to join in on this celebration of butter, sugar, flour and holiday ingredients? Today is the final day, so post your recipe to join us! Head on over to The Sweetest Season landing page to get the details, and I’ll be back on Monday with some holiday breakfast ideas and next weekend with the final round-up of all the beautiful recipes submitted during The Sweetest Season!

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  1. Don’t mean to sound silly- just new to baking… If I’m baking my sweet potatoes, how do I make sweet potato puree? Thanks! LOVE your recipes by the way- SO excited to try them!

    1. Hey Jennifer! Your question isn’t silly at all, and I’m going to make a note in the recipe moving forward to help others. 🙂

      You’ll bake the sweet potatoes. When they’re done, you will let them cool, then peel the skins off. You can either mash them in a bowl together OR blend them in a blender/food processor until smooth. That’ll make the puree!

      Thank you so much! I hope you enjoy these cookies. Happy baking! 🙂

      1. I kind of thought so but it almost seemed too easy. Haha. Thanks so much! I’m actually going to make these for a Thanksgiving cookie platter and use turkey cookie cutters for the kids dessert table- I’m sure the adults will be snagging them too though. ; )

  2. This will probably sound crazy, but I wondered if you’d share your first icing attempt? I’m looking for something that will be stackable, so crunchy doesn’t seem like a bad thing. Was it crunchy but sticky?

    1. Hi Suzy! I’m so sorry, but I don’t have the first icing attempt saved anymore. I think it was crunchy, but it hardened awkwardly, too…

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