Irresistible Sweet Potato Marshmallow Casserole Recipe for Every Occasion

There’s something undeniably comforting about a warm, sugary-sweet dish that brings family together, especially during those cozy holiday afternoons or chilly Monterey evenings. For me, that dish has always been Sweet Potato Marshmallow Casserole—an old family favorite that carries the scent of roasting garlic and fresh herbs in the background, even though it’s sweet. I remember helping Nonna Rosa in her kitchen, where the sweet potatoes were just as important as the savory sauces she’d whip up. Now, as I cook alongside my daughters, Olivia and Isabella, this casserole feels like a delicious thread connecting generations, a dish that’s as familiar as the sound of laughter echoing through the house.

Why You’ll Love This Sweet Potato Marshmallow Casserole

What makes this Sweet Potato Marshmallow Casserole stand out isn’t just its sweet, gooey marshmallow topping or the creamy, spiced sweet potatoes beneath—it’s the way it evokes warmth and nostalgia. Growing up in Monterey, sweet potatoes weren’t always the star of family dinners, but during the holidays, this casserole was the one dish everyone looked forward to. It’s a perfect blend of textures and flavors: the silky, buttery sweet potatoes perfectly balance the crunchy, toasted marshmallows on top.

This recipe is incredibly forgiving, too. Whether you’re an experienced cook or just starting out, you’ll find it approachable and satisfying. Plus, it’s a wonderful way to introduce kids to the magic of baking, much like I did with Olivia and Isabella. Watching them press their little hands into the soft sweet potato mash reminds me of my own flour-covered toddler days, kneading dough next to Nonna Rosa.

And here’s the best part: this casserole isn’t just for Thanksgiving or Christmas. In our coastal town, where the weather can turn chilly unexpectedly, it’s the perfect side to any comforting dinner. It’s like a warm hug from the inside out, and who couldn’t use more of that?

Ingredients You’ll Need for This Sweet Potato Marshmallow Casserole

• 4 large sweet potatoes (about 3 pounds), peeled and cubed
• 1/2 cup unsalted butter, melted
• 1/2 cup brown sugar, packed (light or dark works)
• 1/2 cup whole milk or heavy cream (for extra richness)
• 1 teaspoon pure vanilla extract
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon ground nutmeg
• 1/4 teaspoon salt
• 2 cups mini marshmallows (use vegan marshmallows as a substitution if preferred)
• Optional: 1/2 cup chopped pecans or walnuts for a crunchy topping

Nutrition Facts

• Calories: Approximately 280 per serving (1 cup)
• Protein: 2 grams
• Fat: 10 grams (mostly from butter)
• Carbohydrates: 44 grams
• Fiber: 4 grams
• Sugar: 28 grams (includes natural sugars from sweet potatoes and marshmallows)
• Sodium: 180 milligrams

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Steps to Create Your Sweet Potato Marshmallow Casserole

1. Preheat your oven to 375°F (190°C). This temperature is just right to melt those marshmallows to a golden perfection without burning.
2. Place the peeled and cubed sweet potatoes in a large pot and cover them with cold water. Add a pinch of salt, then bring to a boil over high heat. Reduce to a simmer and cook until the potatoes are fork-tender, about 15-20 minutes.
3. Drain the sweet potatoes well and return them to the pot or a large mixing bowl. Begin mashing with a potato masher or fork until smooth but still a bit rustic—this texture reminds me of the way Nonna Rosa’s hands never aimed for perfection, just love.
4. Add the melted butter, brown sugar, milk or cream, vanilla extract, cinnamon, nutmeg, and salt to the sweet potatoes. Stir until everything is fully incorporated and the mixture is creamy and luscious. At this stage, taste and adjust the sugar or spices if you like it sweeter or more spiced—your kitchen, your rules.
5. Transfer the sweet potato mixture into a buttered 9×13-inch baking dish, spreading it evenly. If you’re a fan of nuts, sprinkle the chopped pecans or walnuts evenly over the top for a wonderful texture contrast.
6. Scatter the mini marshmallows evenly over the surface. This always brings a smile to my daughters’ faces—they love the gooey, toasty top almost as much as the sweet potatoes themselves.
7. Bake in the preheated oven for 20-25 minutes, or until the marshmallows are puffed and golden brown. Keep a close eye near the end—marshmallows can quickly go from golden to charred!
8. Remove from the oven and let the casserole cool for 5-10 minutes before serving. This resting time helps the dish set slightly, making it easier to scoop and savor.

Tips for Making the Best Sweet Potato Marshmallow Casserole

Over the years and many holiday gatherings, I’ve learned a few tricks that make this casserole truly special. Here are some I always share with Olivia and Isabella as we cook together:

• Choose the right sweet potatoes: Look for firm, unblemished sweet potatoes with vibrant orange flesh. The natural sweetness and moisture content vary, so avoid overly dry or mealy ones.
• Don’t over-mash: Leaving a little texture gives the dish a rustic feel. Remember, this isn’t a silky purée but a cozy, homemade casserole.
• Butter your dish well: It prevents sticking and adds a subtle richness around the edges that’s simply irresistible.
• Toast your nuts: If using, lightly toast pecans or walnuts in a dry skillet before adding them. This intensifies their flavor and adds a delightful crunch.
• Watch the marshmallows closely: Every oven is different, so start checking at 18 minutes to avoid burning.
• Make it ahead: You can prepare the sweet potato mash a day in advance and refrigerate it. When ready, assemble and bake. It’s a lifesaver during busy holiday prep.

Serving Suggestions and Pairings

This Sweet Potato Marshmallow Casserole is a versatile side that pairs beautifully with a variety of dishes. At family dinners, I often serve it alongside roasted turkey or glazed ham—the kind of hearty mains that soak up all the buttery sweetness. For my daughters, it’s a treat with simply roasted chicken and sautéed greens. Learn more: Sweet and Savory Sensation: Honeynut Butternut Squash Recipe

One of my favorite memories is sharing this dish during a chilly autumn evening, paired with a robust, garlicky sauté of kale from my mother’s garden. The bitterness of the greens cuts through the sweetness of the casserole, creating a perfectly balanced plate. If you want to add a fresh note, a crisp green salad with a tangy vinaigrette works wonders.

For drinks, a lightly spiced cider or a dry white wine complements the flavors without overpowering them. And if you’re indulging in a full holiday spread, a glass of sparkling water with a twist of lemon keeps the palate refreshed.

Storage and Reheating Tips

After the feast is over, you might have leftovers that deserve a second chance. Store your Sweet Potato Marshmallow Casserole in an airtight container or cover the baking dish tightly with foil or plastic wrap. It will stay fresh in the refrigerator for up to 4 days.

To reheat, I recommend placing the casserole back into a 350°F (175°C) oven, uncovered, for about 15-20 minutes. This helps the marshmallows regain their toasty texture and warms the potatoes evenly. Avoid microwaving if possible, as it can make the marshmallows tough and the dish unevenly heated.

If you want to freeze it, prepare the casserole through step 5 (before adding marshmallows). Cover tightly and freeze for up to 2 months. When ready to enjoy, thaw overnight in the fridge, then add marshmallows and bake as directed. This trick keeps the marshmallows fresh and fluffy.

Frequently Asked Questions

What are the main ingredients for Sweet Potato Marshmallow Casserole?

The main ingredients for Sweet Potato Marshmallow Casserole include the items listed in our ingredients section above. Each ingredient plays a crucial role in achieving the perfect flavor and texture.

How long does it take to make Sweet Potato Marshmallow Casserole?

The total time to make Sweet Potato Marshmallow Casserole includes both preparation and cooking time. Check the recipe card above for exact timing details.

Can I make Sweet Potato Marshmallow Casserole ahead of time?

Yes, Sweet Potato Marshmallow Casserole can often be prepared in advance. Store it properly in an airtight container in the refrigerator and consume within the recommended timeframe.

What can I serve with Sweet Potato Marshmallow Casserole?

Sweet Potato Marshmallow Casserole pairs well with various sides and accompaniments. Consider the serving suggestions mentioned in the recipe for the best dining experience.

Is Sweet Potato Marshmallow Casserole suitable for special diets?

Depending on the ingredients used, Sweet Potato Marshmallow Casserole may be adapted for various dietary needs. Check the ingredients list and consider substitutions as needed for your dietary requirements.

Final Thoughts

Every time I make this Sweet Potato Marshmallow Casserole, I’m reminded of the warmth of my grandmother’s kitchen and the joy of sharing food with family. It’s a dish that carries more than just flavor; it carries stories, love, and tradition. Whether you’re cooking for a holiday, a weeknight meal, or a special family gathering, this casserole is a simple yet heartfelt way to bring everyone closer around the table.

Cooking with my daughters now, I see how these recipes become living memories—flour-dusted hands, shared laughter, and the irresistible pull of a sweet, bubbling dish fresh from the oven. I hope this recipe inspires you to create your own culinary traditions, full of comfort, connection, and joy.