This easy Sweet Potato Casserole is topped with marshmallows and a brown sugar streusel topping. It’s so easy to make, and kids always love it! It’s a Ruth’s Chris Copycat gone wild, so if you love their famous Sweet Potatoes then jump in, and let’s get cooking!

This recipe is undeniably the best marshmallow sweet potato casserole on earth. We just made it again for Thanksgiving, and it was my favorite side dish this year. In fact, I’m going to make it again for Christmas and I think you all should too! They are great for Easter too!

a photo of a round baking dish full of sweet potato casserole topped with gooey marshmallows and a brown sugar streusel topping with a serving being scooped out of the dish

Sweet Potato Souffle with Marshmallows

Several years ago, I remember making this recipe with our four-year-old. She was so excited about making it, that she had call Cade, with my supervision of course, to tell him that SHE just made the best dinner ever. It’s definitely not “dinner” as we had more than just sweet potato casserole for dinner, and she most certainly did not make it all by herself, but the girl did quite a bit! And she loved it! 

Can all of us moms have a moment of silence for a toddler who loved something that would become dinner? Not just ate it, but loved it! Alright, that could have something to do with the amount of sugar and marshmallows in this dish, but I won’t tell if you won’t. 

I used to hate “yams” at Thanksgiving because they were an awful orange, dripping with some weird syrup (gag!), and they tasted like grossness with burned, flat, hard marshmallows on top.

Now I know better. Now I know that it was the person bringing them that was the problem, bless their hearts (that’s what you say to make a mean thing sound better). Sweet potatoes are awesome, they just need to be cooked correctly and if you must do the marshmallow thang, well let’s just do it my way at least. 

Make the sweet taters into a souffle (easy peasy, so don’t get nervous on me…a potato ricer is a game changer) and then use both marshmallows and a brown sugar streusel on top. Trust me, your guests will be BEGGING for the recipe.

a photo of a serving of sweet potato casserole in a small dish with a spoon next to it

Sweet Potato Casserole Ingredients

To make this easy sweet potato casserole recipe with marshmallows, you’ll need: 

  • Sweet Potatoes
  • Egg
  • Unsalted Butter
  • Salt 
  • White sugar
  • Brown sugar
  • Cinnamon 
  • Vanilla Extract
  • Milk
  • Mini Marshmallows
  • All-Purpose Flour
  • Panko Bread Crumbs
  • Graham Cracker Crumbs

The measurements for all the ingredients can be found in the recipe card at the end of this post. You can save or print the recipe there as well.

a photo of a large spoon removing a serving of sweet potato casserole topped with melted marshmallows and brown sugar streusel

How to Make Sweet Potato Casserole

This sweet potato recipe might not be as easy as dumping canned yams into a casserole dish and topping them with marshmallows, but it’s pretty easy nonetheless! Here’s how to make this sweet potato dish: 

  1. Bake the sweet potatoes until tender. 
  2. Peel the sweet potatoes, then mash them in a bowl using a potato masher. 
    • PRO TIP: If you have potato ricer, use that on your sweet potatoes to make them extra silky smooth!
  3. Mix in the egg, butter, salt, sugars, cinnamon, milk, and vanilla using a wooden spoon or hand mixer. 
  4. Turn the mixture into a baking dish, then bake for 30 minutes. 
  5. Remove from oven and top with marshmallows and streusel topping, then return to oven for 20 minutes. 
  6. Let the sweet potato casserole cool for 10 minutes before serving it. 

The complete instructions can be found down below in the recipe so keep scrolling for all the details.

a photo of an unbaked sweet potato casserole topped with mini marshmallows and a brown sugar streusel

Can I Use Canned Sweet Potatoes? 

Yes, you can make this sweet potato recipe with canned sweet potatoes if desired. Just make sure to drain them really well before mashing them. 

Can I Add Nuts to This Sweet Potato Casserole? 

If you prefer your sweet potato casserole with nuts, feel free to sprinkle some on top when you add the marshmallows. Pecans and walnuts would both work nicely here. 

a photo of a serving of sweet potato casserole topped with melted marshmallows and brown sugar streusel in a small bowl

Tips for Making Sweet Potato Casserole

When you first roast the sweet potatoes, you want them to be super soft before mashing them. I can usually tell when my sweet potatoes are finished because they start leaking juice once soft. 

Because the sweet potato mixture is like a souffle, you must include the egg. I don’t know of a way to omit the eggs and still have the texture come out right. 

If you don’t have mini marshmallows on hand, you’re welcome to chop up regular sized marshmallows and use those instead.  

Can Sweet Potato Casserole Be Made Ahead of Time?

Want to make this marshmallow sweet potato casserole ahead of time? Follow these make ahead instructions…You can bake the potatoes and mash them days ahead and store in the fridge in an airtight container. You can make the crumble topping ahead of time too and store in a Ziploc bag, even a month ahead, and store in the freezer. The day before, you can make the souffle and store in the refrigerator. Bake this sweet potato casserole on the day of in order to avoid yucky marshmallows.

a photo of a baking dish full of baked sweet potato casserole topped with melted marshmallows and a brown sugar streusel.

Can Sweet Potato Casserole Be Frozen?

Yes, follow all the instruction for making the souffle and freeze it without the marshmallow and streusel topping. When you’re ready to bake it, let it thaw and then add the toppings and bake as directed.

How to Reheat Sweet Potato Casserole

If you want to reheat a whole casserole, stick it in the oven and warm it up at 300 degrees until heated through. To reheat just a serving, I prefer to just zap it in the microwave.

a photo of a serving of sweet potato casserole with marshmallows and brown sugar crumb topping

This is the best sweet potato casserole recipe and it couldn’t be easier to make! The flavor is irresistible and it’s the one holiday side dish that could pass as a dessert. I can’t wait for you to taste this one!

More Thanksgiving Side Dishes: 

Sweet Potato Casserole

4.42 from 12 votes
Servings: 6
Prep Time: 1 hour
Cook Time: 50 minutes
Total Time: 1 hour 50 minutes

Description

This easy Sweet Potato Casserole is topped with marshmallows and a brown sugar streusel topping. It’s so easy to make, and kids always love it! 


Ingredients 

  • 3 medium sweet potatoes
  • 1 large egg
  • 1/4 cup butter, melted
  • 1 pinch of salt
  • 1/4 cup granulated sugar
  • 1/3 cup brown sugar
  • 1/2 teaspoon cinnamon
  • 1/2 teaspoon vanilla
  • 2 tablespoons milk or heavy cream, (any milk will do)

Topping

  • 2 cups mini marshmallows
  • 1/3 cup butter, cold and cut in cubes
  • 1/2 cup all-purpose flour
  • 3/4 cup brown sugar
  • 1/2 teaspoon cinnamon
  • 1/2 cup panko bread crumbs
  • 1/4 cup graham cracker crumbs

Instructions

Make the Casserole

  • Preheat the oven to 400 degrees F.
  • Place a piece of tin foil on the oven rack.
  • Pierce the sweet potatoes with a fork and bake for 45-60 minutes, or until tender.
    3 medium sweet potatoes
  • Carefully peel the potatoes and turn the oven down to 350 degrees F.
  • Place the sweet potatoes in a large bowl and smash them until smooth.
  • Add the egg, butter, cinnamon, salt, sugars, vanilla and milk.
    1 large egg, 1/4 cup butter, 1 pinch of salt, 1/4 cup granulated sugar, 1/3 cup brown sugar, 1/2 teaspoon cinnamon, 1/2 teaspoon vanilla, 2 tablespoons milk or heavy cream
  • Using a handheld or standing mixer, beat everything together until smooth.
  • Pour the mixture into an 8×9-inch baking dish (8×8 or 9×9 works too) and bake for 30 minutes.
  • Remove from the oven and top with the marshmallows, then the crumb topping (see instructions below on how to make it), making sure to cover the marshmallows as much as possible, and bake for an additional 20 minutes.
    2 cups mini marshmallows
  • Allow to cool for 5 minutes and serve.

Make the Topping

  • In a medium sized bowl, add the cold butter, flour, sugar and cinnamon.
    1/3 cup butter, 1/2 cup all-purpose flour, 3/4 cup brown sugar, 1/2 teaspoon cinnamon
  • Using a pastry cutter or fork, cut into the mixture until the butter is well incorporated.
  • I like to use my hands at the end.
  • Stir in the panko and graham cracker crumbs and set aside until you're ready to top the casserole.
    1/2 cup panko bread crumbs, 1/4 cup graham cracker crumbs

Notes

Want to make this ahead? You can bake the potatoes and mash them days ahead and store in the fridge as well as the crumb topping in a ziploc bag or even a month ahead and store in the freezer. The day before you can make the souffle and store in the fridge. Bake the day of in order to avoid yucky marshmallows

Nutrition

Serving: 1gCalories: 579kcalCarbohydrates: 98gProtein: 5gFat: 20gSaturated Fat: 12gPolyunsaturated Fat: 1gMonounsaturated Fat: 5gTrans Fat: 1gCholesterol: 75mgSodium: 307mgPotassium: 487mgFiber: 4gSugar: 63gVitamin A: 16632IUVitamin C: 3mgCalcium: 100mgIron: 2mg
Author: Sweet Basil
Course: 200+ Easy Side Dish Recipes Every Mom Needs, Over 300 Christmas Recipes and Ideas to Bring the Christmas Spirit
Cuisine: American

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