Old-School Southern Marshmallow Sweet Potato Casserole (Grandma’s Recipe)
This classic Southern Marshmallow Sweet Potato Casserole turns simple sweet potatoes into a rich, velvety, spiced masterpiece. It is topped with a perfectly toasted, gooey marshmallow crust. Moreover, it is an authentic family treasure straight from Grandma’s journal. It brings pure comfort food nostalgia to your table.
Why You’ll Love Grandma’s Marshmallow Sweet Potato Casserole
The Ultimate Comfort Nostalgia: This is the genuine, old-school recipe you remember from childhood family gatherings. There are no fancy shortcuts—just pure homemade comfort.
Perfect Texture Balance: The silky, spice-infused sweet potato base pairs beautifully with the crispy, golden-brown toasted marshmallow topping.
Not Just For The Holidays: As Grandma always said, you don’t need a holiday excuse to make these. It’s the perfect comforting side dish for Sunday dinners or any weeknight when you need a taste of home.
Foolproof & Simple: Made with simple, everyday pantry staples, this low-stress recipe is easy to pull together. It is perfect for any potluck or family meal.
Grandma’s Cooking Tips for Perfect Sweet Potato Casserole
- The Sugar Switch: Grandma always kept things practical. If you run out of light brown sugar, dark brown sugar works bThe Sugar Switch: Grandma always kept things practical in the kitchen. If you run out of light brown sugar, dark brown sugar works beautifully and adds an even deeper, rich caramel flavor to the mash.
- Watch the Marshmallows: Marshmallows go from perfectly golden-brown to burnt in a matter of seconds! Make sure you stay right by the oven door during those last few minutes of baking.
- Make-Ahead Secret: You can easily whip up and mash your sweet potato base in the morning (or even the night before), spread it into your baking dish, cover it, and keep it in the fridge. When dinner time rolls around, just bake it until hot, toss the marshmallows on top, and toast!
What to Serve with Grandma’s Sweet Potato Casserole
This versatile Southern classic pairs beautifully with savory, smoky mains and traditional sides. Turn it into a complete, comforting feast by serving it alongside:
A Southern Spread: Balance the sweet flavors by pairing it with a fresh batch of Old-School Southern Honey Buttermilk Cornbread. In addition, add a savory vegetable side like our Southern Stuffed Yellow Squash.
The Main Event: The rich sweetness of the potatoes makes it a spectacular partner for a juicy baked ham. It is also excellent with crispy Southern Fried Chicken or a savory roasted turkey.
Old-School Southern Marshmallow Sweet Potato Casserole (Grandma’s Recipe)
Equipment
- 1 6 quart stockpot
- 1 drainer
- 1 large bowl
- 1 hand beater
- 2 ½ quart baking dish
- 1 large spoon
Ingredients
- 4 lbs sweet potatoes (about 5 large), peeled and cut into 1-inch pieces
- 1 cup milk
- 6 Tbsps butter, softened
- ½ cup packed brown sugar
- 1 large egg
- 1 ½ tsp ground cinnamon
- ¾ tsp ground allspice
- 1 ½ tsp vanilla extract
- ½ tsp salt
- ¼ tsp ground nutmeg
- 10 large marshmallows, cut in half lengthwise
Instructions
- Preheat the oven to 350°
- Place the sweet potatoes in a 6-quart stockpot, and add water to cover the potatoes.
- Bring to a boil, reduced the heat. Cook uncovered until the potatoes are tender for about 15 to 20 minutes.
- Drain the potatoes, and place them in a large bowl.
- Beat the potatoes, till smooth. Add the next 9 ingredients, which would be all but the marshmallows. Beat until blended.
- spread this mixture into a greased shallow 2 ½ quart baking dish.
- Bake, uncovered, until heated all the way through, about 40 to 45 minutes. Increase the oven setting to 425°.
- top the casserole with marshmallows. Bake until marshmallows are lightly browned, about 3 to 4 minutes longer.
Notes
Nutrition
Serving a steaming dish of this authentic sweet potato casserole takes me right back to warm kitchen afternoons. Those were days surrounded by family, laughter, and the irresistible smell of brown sugar and cinnamon baking in the oven. It’s a recipe that fills the soul just as much as the belly. I hope it brings that same joy to your family’s table.
If you love sweet Southern traditions as much as our family does, make sure to save room after dinner for a warm scoop of Grandma’s Old-Fashioned Southern Peach Cobbler!
Did your grandmother or mother grow up calling these sweet potatoes, or were they always “yams” in your house? What is your absolute favorite main dish to serve alongside a sweet potato casserole? Let me know in the comments below! Please take a quick moment to leave a review and a star rating. Your support helps keep Grandma’s kitchen legacy alive for readers everywhere.
P.S. If you see this popping up on your Facebook or Pinterest feed today thanks to Jetpack, be sure to pin or share it so your fellow home cooks can master the art of traditional Southern baking!
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