Loaded Sweet Potato Casserole

This easy Sweet Potato Casserole recipe is loaded with brown sugar, cinnamon and nutmeg and topped with toasty marshmallows and cinnamon streusel! It’s the best sweet potato side dish to compliment to your Thanksgiving meal!

Sweet Potato Casserole with marshmallows and streusel topping in a white baking dish

Sweet Potato Casserole With Marshmallows Is One of My Favorites

My favorite part of any holiday meal is always the sweet potato casserole. Always. It’s basically earmarked for me. And depending on the number of people joining us for the meal, we may even need to make me my own separate one. At the very least, about half of the casserole is mine. It just is. 🙂 If you take my casserole, you might get some seriously dirty looks. I love it. And it makes sense – it’s like dessert that’s called a side. My kind of side!

Sweet Potato Casserole with marshmallows in a white dish with a scoop being taken out

This Easy Casserole Is Made With Fresh Sweet Potatoes

Growing up, we always made a more traditional sweet potato casserole with marshmallows and used canned sweet potatoes. It’s what I’ve been making for years, so of course I’m a fan.

But lately I’ve been thinking it’d be fun to switch it up. Plus, I’ve been really enjoying fresh sweet potatoes these days and wanted to incorporate them into a new sweet potato casserole. So I decided to ramp up my traditional version and make it even better with fresh sweet potatoes and a combination of marshmallows and streusel. If it’s possible to make sweet potato casserole better, it’s definitely with streusel!

Close up of Sweet Potato Casserole with marshmallows on top and a serving missingOverhead view of Sweet Potato Casserole with toasted marshmallows on top in a white baking dish

How To Make Sweet Potato Casserole

To make this sweet potato casserole, you’ll start off by making the homemade mashed sweet potatoes. Peel and chop up the sweet potatoes and boil them in water until they’re nice and tender. Drain the potatoes and mash them until they’re how you like them. I’m a fan of a pretty smooth mashed sweet potato, but feel free to leave some chunks, if you like.

Next, add your milk, butter, eggs and seasonings. I’ve used plenty of brown sugar, cinnamon and nutmeg, plus some vanilla extract for the ultimate in flavor! Plenty of sweetness and plenty of spice. Just the way sweet potato casserole should be!

To take things to the next level, it’s time for the topping! While you could always just go with marshmallows on their own, the streusel really ramps things up. A little more sweet, a little more cinnamon and nutmeg and a lot more yum!

The casserole is baked in the oven prior to adding the topping, then the topping is added for the last 10 minutes or so.

Can Sweet Potato Casserole Be Made Ahead Of Time?

One of the great things about so many Thanksgiving casseroles is that they can be prepared ahead of time – this one included. The sweet potatoes can easily be prepared and combined and added to the casserole dish a couple days ahead. Just cover the dish and store in the fridge until you’re ready to prepare it. You can either bring the casserole to room temperature before heating it, or put it right in the oven. Just keep in mind that if you put it straight into the oven, it might take a little more time to heat through.

Even the streusel can be made ahead and then added to the casserole when the time comes. Score!

This Sweet Potato Casserole recipe is loaded with all that’s good and it makes the best Thanksgiving side dish! It’s a great way to spice up the more traditional sweet potato casserole and incorporate fresh, homemade mashed sweet potatoes. The sweet marshmallows and streusel are totally delicious! I hope you enjoy it!

Close up of Sweet Potato Casserole with marshmallows in a white dish and a scoop being removed

More Casserole Recipes You Might Like:

Sweet Potato Casserole with Marshmallows
Classic Green Bean Casserole
Overnight Cinnamon Apple French Toast Casserole
Overnight Sausage and Egg Breakfast Casserole

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Sweet Potato Casserole with marshmallows in a white dish with a scoop being taken out

Loaded Sweet Potato Casserole

  • Author: Lindsay
  • Prep Time: 45 minutes
  • Cook Time: 45 minutes
  • Total Time: 1 hour 30 minutes
  • Yield: 8-10 servings
  • Category: Side dish
  • Method: Oven
  • Cuisine: American


This easy Sweet Potato Casserole recipe is loaded with brown sugar, cinnamon and nutmeg and topped with toasty marshmallows and cinnamon streusel. It’s the best sweet potato side dish to compliment to your Thanksgiving meal!


Sweet Potatoes

  • 3 lbs fresh sweet potatoes (45 large sweet potatoes), peeled and cut into 1 inch cubes
  • 1/2 cup (120ml) milk
  • 1 cup (225g) packed light brown sugar
  • 1/4 cup (56g) unsalted butter, melted
  • 2 eggs
  • 1 tsp ground cinnamon
  • 1/2 tsp ground nutmeg
  • 1 tsp vanilla extract
  • Pinch of salt


  • 1/3 cup (44g) all purpose flour
  • 1/3 cup (75g) light brown sugar, packed
  • 1/2 tsp ground cinnamon
  • 1/8 tsp ground nutmeg
  • Pinch of ground cloves
  • 3 tbsp (42g) salted butter, melted
  • 23 cups marshmallows


  1. Preheat oven to 350°F (176°C).
  2. Put the sweet potatoes in a large pot and cover with water. Bring the water to a boil and boil until the potatoes are fork tender, about 8 minutes.
  3. Drain the potatoes and return to the pot. Mash the potatoes until they are your desired level of smoothness.
  4. Add the milk, brown sugar, butter, eggs, cinnamon, nutmeg, vanilla and salt to the potatoes and stir until well combined.
  5. Pour the potatoes into a 9×13 casserole dish. At this point you can cover the dish and refrigerate for up to two days before cooking, or you can put them in the oven right away. Heat them until cooked through, 25-30 minutes (might take less time if you’re cooking them right away).
  6. While the potatoes are cooking (or you could also prepare this ahead of time), combine the flour, brown sugar, cinnamon, nutmeg and cloves for the streusel topping.
  7. Add the melted butter and stir until well combined.
  8. When the casserole is heated through, remove it from the oven and top it with the marshmallows and streusel. I like to add some marshmallows, then the streusel, then the remaining marshmallows.
  9. Bake for another 10-15 minutes. If you want to brown the marshmallows a little more, turn the oven to the broil setting at 400 degrees until they’ve browned to your liking. Serve casserole warm.


  • Serving Size: 1 Slice
  • Calories: 333
  • Sugar: 40.5 g
  • Sodium: 103.5 mg
  • Fat: 9.9 g
  • Carbohydrates: 58.6 g
  • Protein: 4.4 g
  • Cholesterol: 60.4 mg

Keywords: sweet potato casserole, sweet potato casserole recipe, best sweet potato casserole, sweet potato casserole with marshmallows, easy sweet potato casserole, how to make sweet potato casserole


Sweet Potato Casserole photo collage

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Recipe rating

  1. Rachel

    How many days in advance can you make the casserole leave it in the fridge. Then cook it in the oven with the toppings?

    1. Lindsay

      The casserole should last for a total of 4-5 days, so you can make it a few days ahead and have a couple days for leftovers.

      1. Rachel

        This recipe is my go to for Thanksgiving every year! This year I have to make it a few days ahead, everyone eats it up!

  2. Emma

    Hi I haven’t tried this recipe yet, but I have a question: If I made this right before I left for my grandmas house would the marshmallows melt by then, would it be ok to sit, and if so how long for? Cause I’d be leaving at about 6 and dinner would prob be around evening. So I’m thinking it might be best to bake it, then when I get there, when it’s time I’ll just add the streusel and marshmallows and cook it the rest of the way. What do you think is best?

  3. Shauntreva!

    Hi! Quick question, what would you recommend for keeping the potatoes in pieces instead of mashed? Can I follow the same process minus the boiling? I’m wanting to peel, slice, mix and bake. Just wondering if I should change anything in doing that.

  4. Alexis

    I absolutely love this recipe! I grew up only ever eating candied yams but my husband prefers sweet potato casserole. I stumbled upon this recipe and never looked back. It is on our table every holiday. The only thing I do differently is roasting my sweet potatoes instead of boiling just for added flavor. I’ve even made this coconut sugar when I ran out of brown sugar and it was still delicious! I would highly recommend this recipe to anyone. Thanks so much for sharing 💕

  5. Elisabeth

    My teenagers loved this dish because it contains marshmallows AND streusel!  They are allergic to nuts so this was a good option. I used whole milk but could I use skim milk next time? I I would like to make it again this week but I rather use skim milk than whole milk. 

  6. Megan

    Super delicious. Love the crumb topping and. Marshmallow combo!! Might add walnuts next time!!

  7. Hannah

    My dad, who hates most vegetables and won’t eat sweet potatoes, tried this today because we promised it tastes like pumpkin pie. He loved it!
    I did the make ahead method the night before thanksgiving. It was fantastic and simple! 

About Lindsay

I'm a wife and mom to twin boys, a baby girl and a sweet black lab with a serious sweets addiction! Bring on the sugar!

Scripture I’m Loving

“Be joyful in hope, patient in affliction, faithful in prayer.” Romans 12:12