The aroma wafting from my oven is a nostalgic tug at my heartstrings, transporting me back to cozy family gatherings filled with laughter and warmth. This Classic Old Fashioned Sweet Potato Casserole with Marshmallow Topping is the epitome of comfort food—a perfect blend of sweet and creamy that effortlessly walks the line between side dish and dessert. With just a handful of simple ingredients, this recipe not only promises to impress but also allows you to make it ahead of time, freeing you to enjoy the moment. As a crowd-pleaser, it’s a must-have for any Thanksgiving feast or cozy dinner. Who could resist a heaping spoonful of this delightful dish? Let’s dive into the magic of sweet potatoes and experience the nostalgia together!

Why Is This Sweet Potato Casserole Special?
Comfort Food at its finest: This casserole is a nostalgic hug on a plate. With its warm textures and flavors, it brings the entire family together.
Make-Ahead Friendly: Prepare it in advance and save time on busy days, ensuring less stress during special gatherings.
Irresistible Sweetness: The combination of brown sugar and mini marshmallows creates a sweet topping that complements the creamy sweet potato base perfectly.
Crowd-Pleasing Dish: Whether it’s Thanksgiving or a weeknight dinner, this casserole is sure to garner rave reviews from guests of all ages—much like Sausage Potato Soup or Cheesy Broccoli Casserole.
Versatile Variations: Enjoy it as is, or feel free to experiment with nuts or spices to fit your taste. Adjust ingredients for a healthier spin, making it easy to cater to dietary preferences!
Potato Casserole Ingredients
For the Casserole
• Sweet Potatoes – This core ingredient provides the casserole’s natural sweetness and creamy texture; for best results, choose orange-fleshed sweet potatoes, often labeled as yams.
• Unsalted Butter – Adds a rich flavor to every bite; consider using Kerrygold for a creamier profile, but any unsalted butter will do!
• Brown Sugar – Essential for sweetness and moisture; remember to pack it firmly for maximum flavor.
• Salt – Enhances the overall taste; adjust according to your preferences.
• Vanilla Extract – Infuses the casserole with a depth of flavor; opt for pure vanilla for an authentic taste.
For the Topping
• Pecans – These add a delightful crunch and nutty flavor; toasting them beforehand will boost their aroma.
• Mini Marshmallows – A classic topping for that irresistible sweetness and crispy texture; they are optional but highly recommended!
Embrace the heartwarming flavors with this Potato Casserole that brings family and friends together at the table!
Step‑by‑Step Instructions for Classic Old Fashioned Sweet Potato Casserole with Marshmallow Topping
Step 1: Preheat the Oven
Start by preheating your oven to 375°F (190°C). While the oven warms up, grab a 9×13 inch baking dish and generously spray it with nonstick cooking spray. This ensures an easy release for your deliciously baked Potato Casserole, preventing any sticking and making cleanup a breeze.
Step 2: Boil the Sweet Potatoes
Peel and cube enough sweet potatoes to fill about 4 cups. In a large pot, add the sweet potatoes and cover them with cold water. Bring the pot to a boil and simmer for 15-20 minutes, or until the sweet potatoes are fork-tender. Once cooked, drain the water and let the sweet potatoes cool for 5 minutes to prevent any burns during the mash.
Step 3: Mash the Sweet Potatoes
In a large mixing bowl, combine the cooled sweet potatoes with 1/4 cup of unsalted butter, 3/4 cup of brown sugar, a pinch of salt, and 1 teaspoon of vanilla extract. Using a potato masher or fork, mix until you reach your desired smoothness—smooth and creamy or leave it slightly chunky for extra texture.
Step 4: Incorporate Pecans
Gently fold in 1/4 cup of finely chopped pecans into the mashed sweet potato mixture. This not only adds flavor but also a delightful crunch to your Potato Casserole. Once combined, spread the sweet potato mixture evenly into the prepared baking dish, smoothing the top with a spatula for a nice, even surface.
Step 5: Add Toppings
Sprinkle the remaining chopped pecans evenly over the sweet potato mixture. Then, take 2 cups of mini marshmallows and arrange them over the top, spacing them apart to allow room for expansion as they bake. This step is essential for achieving that iconic, gooey sweet topping that everyone loves.
Step 6: Bake the Casserole
Place the baking dish in the preheated oven and bake for approximately 20 minutes. Keep a close watch on your Potato Casserole; the marshmallows should puff up and turn a beautiful golden brown without burning. If they begin to darken too quickly, you can cover the dish lightly with aluminum foil.
Step 7: Rest and Serve
Once baked to perfection, remove the casserole from the oven and let it sit for about 5 minutes. This resting time will make it easier to serve, allowing the layers to set slightly. Scoop generous portions, and revel in the warm, inviting flavors of your Classic Old Fashioned Sweet Potato Casserole with Marshmallow Topping!

Potato Casserole Variations & Substitutions
Feel free to make this cozy casserole your own with these fun and flavorful twists!
- Gluten-Free: Substitute regular flour with almond flour or coconut flour to make a gluten-free version without compromising texture.
- Vegan Delight: Use vegan butter and maple syrup instead of brown sugar for a deliciously plant-based treat.
- Nut-Free Option: Replace pecans with sunflower seeds or omit nuts entirely for those with nut allergies.
- Spice It Up: Add a pinch of cinnamon or nutmeg for that warm, autumn flavor—perfect for holiday gatherings.
- Add a Crunch: Mix in crispy fried onions on top to introduce an exciting crunch, reminiscent of classic green bean casseroles.
- Sweet Potato Twist: Try using mashed butternut squash for a sweeter, slightly different base that’s equally comforting.
- Savory Surprise: Incorporate some cooked bacon bits for a smoky flavor that pairs beautifully with the sweet potatoes.
- Layered Delight: Add a layer of cooked rice or quinoa between the mashed sweet potatoes for added heartiness—a nod to dishes like Chicken Alfredo Casserole.
Embrace your creativity and enjoy this delicious Potato Casserole for every occasion!
What to Serve with Classic Old Fashioned Sweet Potato Casserole
The perfect meal is all about harmonious flavors and textures—bring the warmth of this comforting casserole to life with delightful pairings.
- Roasted Turkey: This festive bird offers a savory balance to the sweet richness of the casserole, perfect for holiday gatherings.
- Honey-Glazed Ham: The sweet, sticky glaze on the ham beautifully complements the caramel notes in the sweet potato casserole, creating a symphony of flavors.
- Cranberry Sauce: The tangy freshness of cranberry sauce cuts through the sweetness, adding a refreshing contrast that rejuvenates each bite.
- Green Bean Almondine: Tender green beans topped with crunchy almonds provide a crisp texture that enhances the overall meal experience.
- Dinner Rolls: Soft, buttery rolls invite you to scoop up the casserole goodness, making every plate deliciously satisfying.
- Cornbread: The slightly sweet cornbread pairs perfectly with the casserole, soaking up its flavorful essence while adding a delightful crumb.
- Spiced Apple Cider: Warm, spiced apple cider is a cozy drink that ties together the sweetness of the casserole and the savory of your meal.
- Pumpkin Pie: To end on a sweet note, a slice of pumpkin pie mirrors the flavors of the casserole, creating a delightful dessert experience.
- Maple-Glazed Carrots: The sweet and earthy notes come together with the casserole for a lovely dish that delights the senses.
Explore these companion dishes to create a memorable meal that warms the heart and soul, ensuring your gatherings brim with love and laughter!
Make Ahead Options
These Classic Old Fashioned Sweet Potato Casserole preparations are perfect for busy cooks looking to save time! You can prepare the sweet potato mixture up to 24 hours in advance; simply mash the sweet potatoes with butter, brown sugar, salt, and vanilla, then store the mixture in an airtight container in the refrigerator. Additionally, you can toast the pecans ahead of time for added flavor. When it’s time to serve, transfer the mixture to your prepared baking dish, sprinkle with pecans and mini marshmallows, and bake for 20 minutes until golden brown. This allows you to have a comforting family favorite ready with minimal effort on the day of your gathering.
Expert Tips for Potato Casserole
- Choose Fresh Potatoes: Select firm, orange-fleshed sweet potatoes for the best flavor and texture; avoid any that are soft or sprouting.
- Proper Cooling: Let the sweet potatoes cool for at least 5 minutes after draining; this prevents burns during the mashing process.
- Chunky vs. Smooth: Decide whether you like your mashed sweet potatoes smooth or slightly chunky; both textures work wonderfully in this Potato Casserole.
- Marshmallow Timing: Add mini marshmallows in the last 10-15 minutes of baking to prevent burning; they should be golden brown for the perfect topping.
- Watch the Oven: Keep a close eye on your casserole in the final minutes; marshmallows can go from perfect to charred very quickly.
How to Store and Freeze Potato Casserole
Fridge: Store leftovers tightly covered for up to 4 days; the flavors deepen and improve after resting, making each bite even more delightful.
Freezer: This Potato Casserole freezes beautifully for up to 3 months. Freeze before adding marshmallows to maintain texture; thaw overnight in the fridge before reheating.
Reheating: To reheat, warm in the oven at 350°F (175°C) for about 20-30 minutes, adding marshmallows in the last 10 minutes for that perfect golden topping.
Airtight Containers: For both fridge and freezer storage, use airtight containers to keep your casserole fresh and to prevent unwanted absorption of odors.

Classic Old Fashioned Sweet Potato Casserole with Marshmallow Topping Recipe FAQs
What is the best way to select sweet potatoes for the casserole?
Absolutely! Look for firm, orange-fleshed sweet potatoes without soft spots or sprouts. The sweeter the potato, the better your casserole will taste. Organic sweet potatoes tend to have a richer flavor and may be a good choice if available.
How should I store leftover potato casserole?
I recommend storing any leftovers tightly covered in the fridge for up to 4 days. This not only preserves the casserole but also allows the flavors to meld, making it a delicious option for a quick meal. Just reheat and enjoy!
Can I freeze the potato casserole? If so, how?
Yes, you can freeze your potato casserole for up to 3 months! For best results, freeze it before adding marshmallows. Just cover it tightly with plastic wrap and aluminum foil. When you’re ready to enjoy it, thaw it overnight in the fridge and then add marshmallows before reheating.
Why are my sweet potatoes lumpy after mashing?
Very! If your sweet potatoes aren’t fork-tender before mashing, this can lead to lumps. Ensure that you boil them long enough (15-20 minutes) and let them cool slightly before mashing with butter, sugar, and vanilla to achieve a smooth consistency. If you prefer a chunkier texture, just mash them a little less.
Can I modify the recipe to accommodate dietary restrictions?
Certainly! You can make this casserole vegan by substituting regular butter with vegan butter and using maple syrup instead of brown sugar. Also, if you’re allergic to nuts, you can simply omit the pecans or substitute them with seeds for added crunch. Embrace the variations and enjoy a delightful meal that everyone can savor!

Heavenly Potato Casserole: A Comforting Family Favorite
Ingredients
Equipment
Method
- Preheat the oven to 375°F (190°C) and spray a 9x13 inch baking dish with nonstick cooking spray.
- Peel and cube sweet potatoes to fill about 4 cups; boil them in a large pot covered with cold water for 15-20 minutes until fork-tender. Drain and cool for 5 minutes.
- In a large mixing bowl, combine cooled sweet potatoes with unsalted butter, brown sugar, salt, and vanilla extract. Mash until desired smoothness.
- Fold in chopped pecans and spread the mixture evenly into the prepared baking dish.
- Sprinkle remaining pecans and arrange mini marshmallows over the top.
- Bake for approximately 20 minutes until marshmallows are golden brown. Cover with foil if they darken too quickly.
- Let the casserole rest for about 5 minutes before serving.

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