Boston Market Sweet Potato Casserole + Video

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Boston Market Sweet Potato Casserole is a creamy sweet potato side dish with marshmallows and streusel. It’s the perfect side for holidays, or any day that ends with Y!

titled collage for Boston Market sweet potato casserole copycat recipe

Boston Market Sweet Potato Casserole

This copycat Boston Market sweet potato casserole combines a rich sweet potato mixture with brown sugar streusel topping and mini marshmallows. It’s popular for a good reason!

It’s always popular, along with my Sausage Cranberry Apple Stuffing, for a Thanksgiving meal that’s sure to please all of your guests. And don’t forget the Cranberry Sauce!

Recipe Video

To see this sweet potato side dish made from start to finish, watch the video! Look for it in the recipe card, at the bottom of this post.

mixing mashed sweet potatoes with brown sugar

Difference Between Sweet Potatoes and Yams

Even though you will see labels for yams and sweet potatoes, what you find at the grocery store is typically two different varieties of sweet potato.

One will have lighter skin and pale yellow flesh, while the other will have darker skin with deep orange flesh. Either will work just fine in this southern sweet potato casserole.

smoothing sweet potatoes in casserole dish

Making Sweet Potato Casserole With Marshmallows

  1. Cook the potatoes.
    Start by boiling the sweet potatoes until you can easily pierce them with a fork. Then place them into a colander in the sink to drain the water out.
  2. Add back to the cooking pot.
    The heat from the pot will help absorb any excess water. Then add and mix in the sugar, butter, cream, and spices until everything is creamy and smooth.
  3. Transfer to baking dish and bake!
    Then, smooth the sweet potato mixture into a greased baking dish and top with marshmallow and streusel. Bake until the top is golden and crispy. It’s that simple!
sweet potato casserole with marshmallows

Boston Market Sweet Potato Casserole Recipe Notes

  • Cook potatoes all the way through.
    It’s easy to feel rushed when cooking a holiday meal, but it’s important that the sweet potatoes are fork-tender. Otherwise, you won’t get the perfectly smooth and creamy sweet potatoes you’re looking for.
  • Heavy cream substitute: Half and half or regular milk can be used instead of cream, though the consistency may be a bit thinner.
  • Nuts or not, Boston Market Sweet Potato Casserole hits the spot!
    Substitute chopped pecans for rolled oats, or use a mix of both!
  • Double the recipe to feed a crowd!
    You can easily double the sweet potato casserole recipe if needed. Bake it in two separate 9×13-inch casseroles dishes, or a 4 quart casserole dish, so it doesn’t bubble over.
mixing streusel topping for sweet potato casserole with marshmallows

Make Ahead Instructions

Prepare the sweet potato casserole base up to 2 days ahead of serving, but don’t bake it! Just cook the sweet potato mixture and place it in your baking dish.

Be sure to cover the casserole dish with plastic wrap or foil, so the potatoes don’t dry out. Then, bring it to room temperature the day of, add the marshmallows and streusel topping, and bake.

Boston Market sweet potato casserole before being put in the oven

Boston Market Sweet Potato Casserole FAQ

How long do leftover sweet potatoes last?

If you store it covered and in the refrigerator, sweet potato casserole should keep for up to 5 days. Reheat in the oven at 350°F, or microwave on medium-high power until warmed through.

scooping sweet potato casserole with marshmallows from baking dish

Can I use canned sweet potatoes instead?

I have not used canned, but some of our TSRI readers make it this way! Be sure to drain and rinse them well to remove the syrup so they aren’t too sweet. Start by mashing them until you have the desired amount.

I don’t have an exact conversion for number of cans, but you will need about 8 cups mashed sweet potatoes to make this copycat Boston Market sweet potato casserole.

How do I make Boston Market sweet potato casserole dairy free?

Butter substitute: To make a dairy free sweet potato side dish, simply replace the butter with margarine, or use vegan baking sticks for easier measuring.

Heavy cream substitute: Coconut cream will give you the closest consistency to heavy cream. It’s the thick portion that sits at the top of a can of full-fat coconut milk.

Some stores carry coconut cream by itself, or try a refrigerated dairy-free heavy cream substitute. In a pinch, use any plant-based milk.

With love, from our simple kitchen to yours. 

sweet potato side dish in white baking dish

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Boston Market Sweet Potato Casserole + Video

Donna Elick
Boston Market Sweet Potato Casserole is a creamy sweet potato side dish with marshmallows and streusel. Perfect for holidays, or any day!
Tried this recipe?Please comment and review!
Prep Time 20 mins
Cook Time 25 mins
Total Time 45 mins
Course Main
Cuisine American
Method Oven
Servings 12


Sweet Potatoes

  • 4 pounds sweet potatoes, peeled and cut into 1” pieces
  • 4 tablespoons unsalted butter, 1/2 stick
  • 3/4 cup packed light brown sugar
  • 1/2 cup heavy cream
  • 1 teaspoon kosher salt
  • 1 tablespoon pure vanilla extract
  • 1 teaspoon ground cinnamon
  • 1/4 teaspoon ground nutmeg


  • 2 cups mini marshmallows
  • 1/2 cup all-purpose flour
  • 4 tablespoons unsalted butter
  • 6 tablespoons packed light brown sugar
  • 1/4 cup old fashioned rolled oats, not instant oats
  • 1/4 teaspoon ground cinnamon


  • Preheat the oven to 350°F. Grease an 8”x10” casserole dish (8×8 or 9×9 works too).
  • Fill a large pot with sweet potato pieces and enough water to cover by 2 inches. Bring to a boil over high heat and cook until fork tender, about 10 minutes.
  • Drain water from potatoes and return potatoes to the pot. Using a potato masher or electric mixer, mash until mostly smooth. Add remaining ingredients (except topping ingredients and mix until combined.
  • Spoon sweet potatoes into the casserole dish and use the back of a wooden spoon or mixing spatula to smooth out. Sprinkle marshmallows over top of mashed sweet potatoes.
  • Add butter to a medium sized microwave safe bowl. Microwave on full power to melt the butter. Add remaining topping ingredients to the bowl, and use a fork to combine. Sprinkle over the top of casserole.
  • Place the casserole in the preheated oven and bake for 20-25 minutes, or until the streusel is crisp and marshmallows are golden brown.
  • Serve while warm, and enjoy!


Donna’s Notes

Make Ahead Instructions
Prepare the mashed sweet potatoes the day before and place them in your baking dish. Cover the dish with plastic wrap and refrigerate overnight. Bring it to room temperature the day of, add the marshmallows and streusel topping, and bake per recipe instructions.


Serving: 1 | Calories: 475cal | Carbohydrates: 89g | Protein: 6g | Fat: 11g | Saturated Fat: 7g | Cholesterol: 31mg | Sodium: 366mg | Sugar: 36g | Fiber: 9g | Calcium: 115mg | Iron: 2mg

All nutritional information is based on third party calculations and is only an estimate. Each recipe’s nutritional value will vary depending on the ingredients used, measuring methods, and portion sizes.

Tried this recipe?Let us know how it was!
sweet potato casserole with marshmallows

Originally published November 2013, updated and republished November 2020.

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  1. Hi! I am totally going to make this for Thanksgiving this year! Could this be made in the crock pot? Maybe on low setting? I want to be sure it stays warm for serving. Thanks!

  2. I've been using this EXACT recipe from you for a few years and it is my family's most requested sidedish holiday after holiday!

  3. This is hands down, the most requested dish at Thanksgiving in my family! I found your recipe years ago and have used it every single year since. We have two Thanksgivings, Thursday and Friday! I make one for each day and a smaller version just for my husband to have for a few extra days! Thank you for sharing this amazing recipe!

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