Sweet Potato Marshmallow Casserole

Category: Recipes That Started My Cooking Journey

This comforting side combines mashed sweet potatoes with butter, maple syrup, cinnamon, and nutmeg, resulting in a smooth, flavorful base. Topped generously with mini marshmallows, the casserole bakes until the topping turns golden and bubbly, offering a delightful contrast of gooey sweetness and earthy spice. Easy to prepare in advance, it’s ideal for Thanksgiving, Christmas, or family gatherings. The warming aroma and creamy texture make it a go-to dish that pleases all ages, proving sweet and savory can harmonize beautifully on the holiday table.

Lili Clark smiling at the camera.
Created By Lili Clark
Updated on Mon, 03 Nov 2025 20:21:18 GMT
A spoon is in a dish of sweet potato casserole with marshmallows. Save
A spoon is in a dish of sweet potato casserole with marshmallows. | lilicooks.com

This creamy sweet potato casserole comes out every holiday season at my house it never fails to get everyone at the table buzzing with anticipation Just imagine the scent of warm spices and melting marshmallows wafting from the oven filling your kitchen with pure comfort

I first made this for a Friendsgiving and it instantly became the most requested side now the kids ask for it every year and even the marshmallow skeptics go back for seconds

Ingredients

  • Sweet potatoes: Three pounds of sweet potatoes give you that signature rich creamy base Choose ones with vibrant orange flesh for best flavor and texture
  • Whole milk: Adds creaminess for luxurious mashed potatoes Use whole milk for optimal results
  • Salted butter: One stick brings depth and richness Make sure your butter is fresh for the best taste
  • Brown sugar: A little brown sugar deepens the sweetness and adds caramel notes Always pack it lightly to keep from overpowering the casserole
  • Kosher salt: Enhances all the flavors Take a pinch between your fingers and sprinkle evenly for seasoning control
  • Ground cinnamon: The essential spice for warmth and aroma Use fresh cinnamon whenever possible for best results
  • Ground nutmeg: Adds gentle spice and complexity Grate your own if possible for more intense flavor
  • Ground clove: A tiny amount infuses the whole dish with cozy notes but do not overdo it
  • Maple syrup: For natural sweetness and subtle flavor Choose pure maple syrup not pancake syrup
  • Vanilla extract: Brings everything together opt for pure vanilla extract if you can
  • Mini marshmallows: The finishing touch for gooey golden topping Use fresh marshmallows that are still pillowy soft

Step-by-Step Instructions

Preparation:
Peel and cut sweet potatoes into equal size cubes This ensures even cooking
Boil the Sweet Potatoes:
Place potato cubes in a large pot and cover with cold water Add a generous amount of salt Bring to a boil over high heat then lower to a simmer Cook for 10 minutes or until a fork slides in with no resistance
Mash the Potatoes:
Drain potatoes completely and return them to the warm pot Mash thoroughly using a potato masher or hand mixer The goal is a velvety texture with no lumps
Mix in the Good Stuff:
Add the milk butter brown sugar salt cinnamon nutmeg clove maple syrup and vanilla to the mashed potatoes Stir until everything is fully blended and the mixture looks glossy and smooth Taste and adjust seasoning if needed
Transfer to Baking Dish:
Spoon the sweet potato mixture into a large oven safe baking dish Smooth the top with a spatula for even browning later
Top with Marshmallows:
Evenly sprinkle a full layer of mini marshmallows over the potatoes Make sure every inch is covered for best results
Bake to Perfection:
Place the dish in a preheated oven at 375 degrees Fahrenheit Bake for 20 to 25 minutes until the marshmallows are deeply golden and the filling starts to gently bubble around the edges
Rest Before Serving:
Allow casserole to rest for five minutes before scooping in This lets the texture set so you get those perfect scoops
A close up of a sweet potato casserole with marshmallows. Save
A close up of a sweet potato casserole with marshmallows. | lilicooks.com

I always look forward to swirling the gooey marshmallow topping as it toasts it turns perfectly golden and brings out my inner kid This dish was always the centerpiece on my childhood holiday tables and now it is something I make with my own kids every year

Storage Tips

Let any leftovers cool fully before storing Transfer to an airtight container and refrigerate for up to four days To serve reheat just until warmed through either in the oven at a low temperature or the microwave for individual portions Avoid letting the marshmallows get too dark when reheating by covering loosely with foil

Ingredient Substitutions

You can use half and half or even a dairy free milk for a similar creamy texture if you need a substitution Unsalted butter works just add a pinch more salt For a less sweet version swap some or all of the brown sugar and maple syrup for honey Or if you want a crunchy finish add a pecan streusel topping beneath the marshmallows

A slice of sweet potato casserole with marshmallows. Save
A slice of sweet potato casserole with marshmallows. | lilicooks.com

Serving Suggestions

This casserole makes a beautiful addition to your Thanksgiving or Christmas table Its warm colors and fluffy topping look fantastic next to roasted turkey or ham You can also pair it with roast chicken or pork for any cozy winter dinner I love scooping extra gooey marshmallow bits onto every serving

A Bit of History

Sweet potato casserole with marshmallows is a uniquely American dish with roots in early twentieth century advertising campaigns for marshmallows It has become a symbol of classic holiday comfort food growing from Southern traditions to tables across the country Generations of families continue to pass down their own special versions

Recipe FAQs

→ Can I prepare this dish ahead of time?

Yes, you can assemble the casserole and refrigerate it (without the marshmallows) up to a day ahead. Add marshmallows just before baking.

→ How do I make the topping extra gooey?

Spread mini marshmallows evenly over the sweet potato mixture and bake until just golden for the ultimate oozy top.

→ What are alternatives to marshmallows?

Try a pecan streusel, chopped candied pecans, or leave plain for a less sweet finish.

→ Can I use canned sweet potatoes?

Canned sweet potatoes work in a pinch; drain well and reduce added sugar since they’re often pre-sweetened.

→ How should leftovers be stored?

Refrigerate cooled portions in an airtight container for up to 3 days. Reheat in the oven to refresh the topping.

→ What makes this side dish unique?

The blend of brown sugar, spices, and maple syrup creates a harmonious balance between sweetness and earthiness, topped with golden marshmallows.

Sweet Potato Marshmallow Casserole

Creamy sweet potatoes with cinnamon, brown sugar, and gooey marshmallow topping. Perfect side for any holiday meal.

Preparation Time
15 min
Cooking Time
35 min
Overall Time
50 min
Created By: Lili Clark

Category: Grandma's Legacy

Skill Level: Beginner-Friendly

Cuisine Type: American

Output: 10 Serves

Dietary Options: Vegetarian, Gluten-Free

Ingredients

→ Sweet Potato Casserole Base

01 3 lbs Sweet Potatoes, peeled and cubed
02 1 cup Whole Milk
03 1 stick Salted Butter
04 ¼ cup Brown Sugar, loosely packed
05 ½ teaspoon Kosher Salt
06 1 teaspoon Ground Cinnamon
07 ¼ teaspoon Ground Nutmeg
08 ¼ teaspoon Ground Clove
09 ¼ cup Maple Syrup
10 ½ teaspoon Vanilla Extract

→ Topping

11 1 bag Mini Marshmallows

Steps

Step 01

Set the oven to 375°F (190°C).

Step 02

Place the cubed sweet potatoes in a large pot and cover with cold water. Season water generously with salt and bring to a boil. Reduce to a simmer and cook for 10 minutes, or until fork tender.

Step 03

Drain the sweet potatoes and return them to the pot. Mash until smooth, ensuring no large lumps remain. Mix in the milk, butter, brown sugar, salt, cinnamon, nutmeg, clove, maple syrup, and vanilla until fully incorporated.

Step 04

Pour the seasoned sweet potato mixture into a large oven-safe baking dish. Smooth out the top evenly.

Step 05

Spread the mini marshmallows evenly over the sweet potato mixture.

Step 06

Bake in the preheated oven for 20–25 minutes, until the marshmallows are golden brown and the casserole is bubbling.

Step 07

Remove the casserole from the oven and allow it to rest for 5 minutes before serving.

Tips

  1. This dish is a great make-ahead option for holidays or gatherings.
  2. To prevent sticking, use parchment paper under the marshmallows.

Required Tools

  • Large Pot
  • Potato Masher
  • Oven-Safe Baking Dish

Allergy Information

Always check each ingredient for allergens, and consult a medical professional if unsure.
  • Contains dairy (butter, milk)

Nutritional Information (per serving)

These details are shared for general guidance and don’t replace professional advice.
  • Calories: 300
  • Fats: ~
  • Carbohydrates: ~
  • Proteins: ~