Sweet Potato Casserole with Marshmallow Streusel Topping

by Aimee Stock
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Last Updated on October 27, 2021 by Aimee Stock

This recipe for Sweet Potato Casserole with Marshmallow Streusel Topping will satisfy the sweet tooth in anyone who indulges! Not only did I include the obligatory marshmallows, I added a classic Streusel topping made with nuts, brown sugar, melted butter and flour. I am pretty sure the picture speaks for itself, but you really need to add this one to your holiday lineup. Not only is is delicious, but it’s a showstopper.

Bite shot of Sweet Potato Casserole with Marshmallow Streusel Topping

How to make my Sweet Potato Casserole with Marshmallow Streusel Topping

Contents

The most time consuming part of this entire recipe is roasting the sweet potatoes. I begin by thoroughly scrubbing and rinsing them. Dry them with paper towels and place on a parchment or silicone mat lined sheet pan.

Bake at 400 degrees until a knife inserts without any resistance. Try to get potatoes that are relatively the same size so they cook at the same rate. I had two thinner ones, so I removed them when they were done and continued with the other two.

Baking the sweet potatoes

Allow the sweet potatoes some time to cool enough to handle. I create a slice through vertically to allow the steam to escape.

While they are still warm, add the butter, salt and pepper. Because I am adding the Streusel topping, I skipped the brown sugar I would normally add in this step.

Adding the butter and seasonings

Beat with a hand mixer until you achieve a smooth puree.

Beat until smooth

Spread into your baking dish and smooth with an offset spatula or the back of a spoon.

Spread into a baking dish

How to create a Streusel Topping

Next, it’s time to create that Streusel topping. You’ll need:

  • Melted Butter
  • Brown Sugar
  • All Purpose Flour
  • and Nuts, such as Pecans or Walnuts chopped finely
Combine streusel ingredients for Sweet Potato Casserole with Marshmallow Streusel Topping

When you stir it together, it should look like this. As it sits, it will absorb more of that flour and you should be able to easily crumble it with your fingers over the casserole.

Finished streusel topping

I couldn’t find mini marshmallows, so I cut my larger sized marshmallows in half to create this diagonal pattern.

In between the rows, I added the Streusel mixture.

Layering the topping for Sweet Potato Casserole with Marshmallow Streusel Topping

Bake for about 20-30 minutes (depending on your oven) until the marshmallows are melty and golden. Keep an eye on things as the marshmallows start to toast as it can go quickly at this point.

Allow the casserole to set for 10 minutes before serving. It’s VERY hot!

Baked Sweet Potato Casserole with Marshmallow Streusel Topping

Did you make my Sweet Potato Casserole with Marshmallow Streusel Topping? Leave me a comment below and let me know what you thought!

You can also tag me on Instagram with your creations at @aimee_stock. I love seeing what you come up with!

PIN for Sweet Potato Casserole with Marshmallow Streusel Topping

Sweet Potato Casserole with Marshmallow Streusel Topping

Sweet Potato Casserole with Marshmallow Streusel Topping
Prep Time20 minutes
Cook Time30 minutes
ROASTING SWEET POTATOES30 minutes
Total Time1 hour 20 minutes
Course: Side Dish
Cuisine: American
Servings: 6 servings
Calories:

Equipment

  • Sheet Pan lined with parchment or silicone mat
  • Hand (or Stand) Mixer
  • Oven Safe Baking Dish

Ingredients

  • 2 medium Sweet Potatoes washed, dried and roasted until tender
  • 1/4 c Butter
  • Salt & Pepper to taste

FOR THE TOPPING:

  • 1 handful Marshmallows cut, if desired (or use mini marshmallows)
  • 1/2 c Brown Sugar
  • 1/2 c Nuts (such as Pecans or Walnuts) very finely chopped
  • 1/3 c All Purpose Flour add another tablespoon if too wet
  • 1/3 c Butter melted

Instructions

  • Preheat the oven to 400 degrees and line a baking sheet with parchment or a silicone baking mat.
  • Wash and dry the sweet potatoes, then place on the baking sheet and roast for about 30-40 minutes (depending on size and your oven) until a knife inserts without any resistance. Allow to cool enough to handle.
  • Remove the sweet potato from the skin. I ended up using two large sweet potatoes. Add butter, salt and pepper.
  • Stir together the Streusel ingredients and cut marshmallows in half, if desired.
  • Evenly distribute the sweet potato mixture into your baking dish, then top with marshmallows alternating with the Streusel mixture.
  • Bake for about 20-30 minutes or until the marshmallows are golden and melted.
  • Allow to cool for 10 minutes prior to serving. That sugar mixture is VERY hot.

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