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Sweet Potato Casserole with Marshmallows and Cinnamon Streusel

November 4, 2017 by Olya 25 Comments

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Sweet Potato Casserole with Marshmallows and Cinnamon Streusel goes great alongside festive holiday meals or low-key weekday dinners. It’s the ultimate side dish for any meal. Everything except for easy brown sugar streusel can be made ahead.
Sweet Potato Casserole with Marshmallows and Cinnamon Streusel

Deliciously soft and moist sweet potatoes are simply amazing with brown sugar, vanilla, nutmeg and cinnamon.

Marshmallows and Sweet Potatoes

If you are not a sweet potato person, you will be a fan after tasting them in this sweet potato casserole recipe. And marshmallows are a perfect complement to the sweet potatoes!

That doesn’t come as a surprise at all, since Boston Market restaurant chain uses marshmallows on their signature sweet potato side dish all year long.

How to make Cinnamon Streusel Topping

The combination of melted marshmallows in the topping and the cinnamon streusel is what really makes this dish taste the best.
The streusel is made with flour, brown sugar, cinnamon and nutmeg.
Sweet Potato Casserole with Marshmallows and Cinnamon Streusel
To make Streusel topping, combine 1 cup flour, 1/4 tsp salt, 1 tsp ground cinnamon and 6 tbsp butter.
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Get ready to crumble! Using your fingers rub the butter in the the flour, then add 1/4 cups sugar until lumps form. Then stop.

I, on the other hand, really got into it and rubbed the butter into the flour way too effeciently which made it look bread-crumby. Don’t do that unless you like fine crumbs.

You know what else works really well to help make it right? Adding a bit of water will make it more sticky and more clumpy mix that bakes nice and crunchy.
Sweet Potato Casserole with Marshmallows and Cinnamon Streusel

How to make sweet potato casserole

Step 1 is to cook cut up sweet potato pieces until fork tender, about 15 to 20 minutes and then drain them. And then simply add butter, brown sugar, nutmeg and cinnamon.
Sweet Potato Casserole with Marshmallows and Cinnamon Streusel
Mash potatoes with a potato masher (that’s what I used) or blend with an electric mixer, until mostly smooth.
Sweet Potato Casserole with Marshmallows and Cinnamon Streusel
Add heavy cream and combine for another minute until incorporated.
Sweet Potato Casserole with Marshmallows and Cinnamon Streusel
Transfer sweet-potato mixture to a 2-quart baking dish. (To make ahead, refrigerate, up to 1 day.). Top with LOTS of mini marshmallows.
Sweet Potato Casserole with Marshmallows and Cinnamon Streusel

Finally add prepared cinnamon streusel topping:
Sweet Potato Casserole with Marshmallows and Cinnamon Streusel

Bake the sweet potato casserole at 375 F until center is warmed through and marshmallows are lightly browned, 30 minutes.

Health Benefits of Sweet Potato Casserole

Sweet potatoes are some of the healthiest foods you can find on your holiday menu!

Sweet potatoes are an excellent source of vitamin A, which is essential for the immune system and mucus membranes. It also acts as an antioxidant, protecting cells from free radical damage . The potatoes also provide us with vitamin C, manganese, copper, and vitamin B6.

What to serve with the sweet potato casserole

  • Grand Marnier Cranberry Sauce
  • Easy No Bake Lemon Pudding Cream Pie
  • Slow Cooker Barbecue Beef Brisket

More Holiday recipes

Creamy Bacon Brussels sprouts
Roasted Butternut Squash and Brussels sprouts
Roasted Spatchcock Chicken with Garlic Mustard Crust

Sweet Potato Casserole with Marshmallows
Print Recipe
4.8 from 5 votes

Sweet Potato Casserole with Marshmallows and Cinnamon Streusel

It’s the ultimate side dish for any meal. Everything except for easy brown sugar streusel can be made ahead.
Prep Time15 mins
Cook Time30 mins
Total Time45 mins
Course: Side Dish
Cuisine: American
Keyword: sweet potato casserole
Servings: 6 servings
servings
Author: Olya

Ingredients

Sweet Potatoes

  • 5 pounds sweet potatoes (peeled and cut into 1” pieces)
  • 4 tablespoons unsalted butter (1/2 stick)
  • 1/2 cup brown sugar
  • 1/2 tsp salt
  • 1 tsp pure vanilla extract
  • 1.5 tsp ground cinnamon
  • 1/4 tsp ground nutmeg
  • 1/2 cup heavy cream
  • 2 cups mini marshmallows

Brown Sugar Streusel Topping

  • 1 cup all-purpose flour
  • 1/4 tsp salt
  • 1 tsp ground cinnamon
  • 6 tbsp unsalted butter room temperature
  • 1/4 cup dark brown sugar (packed)

Instructions

Streusel Topping

  • Mix flour, salt, ground cinnamon, butter and dark brown sugar with a fork until a desired crumble texture is achieved. Add more sugar if you want finer crumbs.

Sweet Potatoes

  • Bring large pot with water to boil over high heat. Add sweet potato pieces and cook until fork tender, about 15 to 20 minutes. 
  • Drain potatoes and place them back into pot or large bowl. Mash potatoes with a potato masher or blend with an electric mixer, until mostly smooth.
  • Add butter, brown sugar, salt, vanilla extract, nutmeg and cinnamon and using a potato masher, mash until combined.
  • Add heavy cream and combine for another minute until well incorporated.
  • Transfer sweet-potato mixture to a 2-quart baking dish. Top with 2 cups of mini marshmallows and set aside.
  • Preheat oven to 375 F.

Final Assembly

  • Top the sweet potato mixture and marshmallows with the prepared crumble topping.
  • Bake at 375F until center is warmed through and marshmallows and topping is lightly browned, 30 minutes.
Nutrition Facts
Sweet Potato Casserole with Marshmallows and Cinnamon Streusel
Amount Per Serving
Calories 800 Calories from Fat 234
% Daily Value*
Fat 26g40%
Saturated Fat 16g100%
Cholesterol 77mg26%
Sodium 530mg23%
Potassium 1347mg38%
Carbohydrates 134g45%
Fiber 12g50%
Sugar 52g58%
Protein 9g18%
Vitamin A 54505IU1090%
Vitamin C 9.1mg11%
Calcium 169mg17%
Iron 3.6mg20%
* Percent Daily Values are based on a 2000 calorie diet.

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Filed Under: All Recipes, Holiday Recipes, Side Dishes Tagged With: Cinnamon, Marshmallows, Sweet Potato

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If you liked or disliked the recipe - please leave your comment and STAR RATING in the comments section below! I look forward to new ideas and comments!

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Reader Interactions

Comments

  1. Tiara

    November 26, 2020 at 4:53 am

    I’m curious as to why the streusel topping can’t be made the night before

    Reply
    • Olya

      November 26, 2020 at 1:41 pm

      Yes, you can and keep in an airtight container in the refrigerator until ready for use.

      Reply
  2. Jess

    November 25, 2020 at 5:14 pm

    So excited to try this recipe! Is there a way to substitute the heavy cream?

    Reply
    • Olya

      November 26, 2020 at 1:36 pm

      You can use half and half.

      Reply
  3. Faith

    November 24, 2020 at 8:20 am

    Would there be a way to substitute canned yams for the sweet potatoes? Do you know how much yams you would use? I am cooking everything myself this year, so looking to make it a little easier.

    Reply
    • Olya

      November 26, 2020 at 1:41 pm

      Yes, of course!

      Reply
  4. Jen

    November 22, 2020 at 9:32 pm

    Hands down the best sweet potato dish I have ever had. Everyone at my Thanksgiving table agreed—even the people who don’t like sweet potatoes loved this!

    Reply
    • Olya

      November 24, 2020 at 12:05 am

      So glaaaad it was the best sweet potato dish at your table!!!

      Reply
  5. Christina

    December 24, 2019 at 1:13 pm

    Can I make it the day before and just add the toppings the next day and pop in the oven?

    Reply
    • Olga

      December 25, 2019 at 11:19 am

      Yes, it would be perfectly fine

      Reply
  6. Laura

    November 27, 2019 at 3:47 pm

    Can bananas be incorporated in this dish

    Reply
    • Olga

      November 27, 2019 at 4:25 pm

      Yes!

      Reply
  7. Julio

    November 25, 2019 at 9:20 pm

    How many people does this serve?

    Reply
    • Olga

      November 25, 2019 at 11:14 pm

      Six large servings.

      Reply
  8. Johnny

    November 18, 2017 at 7:49 pm

    I thought that sweet potatoes needed more sugar. Other than that, I liked it.

    Reply
  9. Fiona

    November 16, 2017 at 7:49 pm

    I tried it exactly as the recipe – it reminded me of Boston Market’s sweet potatoes. Very good.

    Reply
  10. Valerie

    November 15, 2017 at 7:48 pm

    I added pecans into the topping, I chopped them pretty well and really loved it!

    Reply
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