As the holiday season approaches, I find myself reminiscing about the family gatherings that revolve around the kitchen—a hub of warmth and love. One dish that consistently graces our table is Grandma’s Comforting Sweet Potato Casserole. This beloved recipe transforms creamy sweet potatoes, brown sugar, and cinnamon into a heartwarming dish topped with a crunchy streusel and gooey marshmallows, making it an irresistible centerpiece for Thanksgiving and Christmas feasts. Not only is this potato casserole a delightful comfort food, but it’s also simple to prepare, allowing you to spend more quality time with loved ones. With familiar flavors and a touch of nostalgia, this casserole is sure to evoke smiles and spark memories. Ready to bring a taste of tradition to your own holiday table? Let’s dive into this comforting recipe together!

Why Is This Potato Casserole Special?
Nostalgic Tradition: This casserole embodies the spirit of holiday gatherings, evoking cherished memories with every bite.
Creamy Goodness: With its smooth sweet potato base and rich flavors, it’s a comforting delight that everyone will love.
Easy Preparation: You’ll find that this recipe simplifies your holiday cooking, making it accessible for all skill levels.
Crowd Favorite: Its irresistible combination of crunchy pecans and marshmallows makes it a hit among family and friends.
Versatile Topping Options: Feel free to get creative—try adding coconut or apple slices for a unique twist! You could also pair it with Cheesy Broccoli Casserole or serve alongside your favorite stuffing for a complete holiday feast.
Potato Casserole Ingredients
For the Casserole
- Sweet Potatoes – Fresh sweet potatoes work best for a creamy texture; canned sweet potatoes can be used with proper draining.
- Brown Sugar – Adds a deep sweetness; white sugar can substitute, but may alter the flavor slightly.
- Eggs – Essential for achieving that rich, custard-like filling; consider using an egg substitute for allergies.
- Milk – Use warm milk for optimal blending; non-dairy milk can work just as well.
- Unsalted Butter – Boosts richness in flavor; margarine or dairy-free options can be used if needed.
- Vanilla Extract – Adds a lovely layer of warmth and depth to the casserole.
- Cinnamon and Nutmeg – These comforting spices bring an inviting aroma to the dish.
For the Topping
- Pecans – Toasted pecans enhance the crunch and depth of flavor; walnuts are a good alternative, or omit for a nut-free dish.
- All-Purpose Flour – Provides structure for the streusel; gluten-free flour is a perfect substitute if necessary.
- Mini Marshmallows – For that sweet, gooey topping—feel free to adjust to your preference or use graham cracker crumbs for a different twist!
Enjoy crafting this delightful potato casserole, where each ingredient plays a crucial role in creating a heartwarming and memorable holiday centerpiece!
Step‑by‑Step Instructions for Grandma’s Comforting Sweet Potato Casserole
Step 1: Preheat the Oven
Begin by preheating your oven to 350°F (175°C). As it warms up, prepare a 9×13 inch baking dish by greasing it with unsalted butter or baking spray. This step ensures your delicious potato casserole won’t stick and will bake evenly, making for a perfect holiday dish.
Step 2: Toast the Pecans
Next, spread your pecans evenly on a baking sheet. Toast them in the preheated oven for about 5-7 minutes, or until they become fragrant and slightly golden. Keep an eye on them to prevent burning, then remove from the oven, chop, and set aside to cool. The toasted pecans will add a delightful crunch and depth to your casserole.
Step 3: Cook the Sweet Potatoes
In a large pot, bring water to a boil. Carefully add your peeled and diced sweet potatoes, allowing them to cook for about 15 minutes, or until they’re fork-tender. Once ready, drain the sweet potatoes and let them cool slightly. This simple step is key to achieving the creamy texture in your potato casserole.
Step 4: Mash the Sweet Potatoes
Transfer the drained sweet potatoes into a mixing bowl and mash them until smooth. Allow them to cool for a few moments, as this will help incorporate the other ingredients better. The sweet potatoes serve as the comforting base of your casserole, bringing a natural sweetness that balances perfectly with the toppings.
Step 5: Prepare the Filling
In a separate bowl, combine softened unsalted butter, brown sugar, all-purpose flour, and warm milk. Mix well until a crumbly texture forms, then fold in a pinch of cinnamon and nutmeg for that familiar holiday aroma. This mixture will add a delicious layer to your sweet potato casserole.
Step 6: Combine the Ingredients
Now, add brown sugar, eggs, milk, vanilla extract, and spices to the mashed sweet potatoes. Mix everything until smooth and well combined. This step ensures that the rich sweetness and spiced flavors are evenly distributed throughout your casserole, enhancing its comforting nature.
Step 7: Layer the Casserole
Pour half of the sweet potato mixture into your greased baking dish and spread it evenly. Next, sprinkle half of the crumbly filling mixture on top, followed by the remaining sweet potato mixture. Repeat the layering with any leftover topping and finish with the toasted pecans and mini marshmallows for that irresistible, gooey finish.
Step 8: Bake the Casserole
Carefully place the assembled sweet potato casserole in the preheated oven and bake for approximately 30 minutes. You’ll know it’s done when the top is golden and bubbly, with marshmallows slightly toasted. If the marshmallows brown too quickly, cover the casserole with foil to prevent burning while the inside cooks through.
Step 9: Serve and Enjoy
Once baked, let the casserole rest for a few minutes to cool slightly and set. Then, serve warm, allowing everyone to enjoy a generous helping of this delightful potato casserole. With its inviting flavors and creamy texture, it’s sure to be a highlight at your holiday gatherings!

What to Serve with Grandma’s Comforting Sweet Potato Casserole
As you prepare to dazzle your family with this heartwarming casserole, consider complementing it with dishes that enhance the flavors and create a memorable feast.
- Oven-Roasted Turkey: This classic main dish adds a savory touch that balances the sweetness of the casserole, making it a must-have for holiday gatherings.
- Garlic Green Beans: Crisp, tender green beans provide a fresh, vibrant contrast to the rich potato casserole. Sautéing them with garlic adds a delightful depth of flavor that everyone will love.
- Classic Stuffing: The herby, seasoned breadcrumbs give a comforting texture that pairs beautifully with the creamy sweetness of the casserole, rounding out your holiday spread.
- Cranberry Sauce: A tart, fruity side like cranberry sauce brightens the palate and balances the richness of the potato casserole, offering a refreshing contrast on each bite.
- Roasted Brussels Sprouts: Their slight bitterness and crispy leaves create an exciting contrast in both texture and flavor, complementing the sweetness of the casserole. A drizzle of balsamic vinegar elevates this pairing even further.
- Warm Dinner Rolls: Soft, buttery rolls are perfect for scooping up bites of the potato casserole and adding a delightful, comforting element to your meal.
- Apple Pie: Finish your feast with a slice of warm apple pie, offering a classic dessert experience that echoes the sweet, spiced notes of the casserole while celebrating the season.
- Eggnog: This creamy, spiced beverage adds a festive touch to your meal, pairing beautifully with both sweet and savory components, including the potato casserole.
- Hot Apple Cider: A warm cup of spiced apple cider brings comfort, evoking feelings of nostalgia and warmth, perfectly complementing the holiday spirit of the casserole.
- Chocolate Pecan Pie: For dessert lovers, the rich, nutty flavors of chocolate pecan pie create a decadent end to the meal, harmonizing with the cozy notes of the potato casserole.
Storage Tips for Sweet Potato Casserole
- Fridge: Store your cooked sweet potato casserole in an airtight container for up to 3-5 days. Ensure it cools completely before sealing to maintain freshness.
- Freezer: For longer storage, wrap the casserole tightly in plastic wrap and aluminum foil, and freeze for up to 3 months. Thaw it overnight in the fridge when ready to reheat.
- Reheating: To reheat, bake the casserole in a preheated oven at 350°F (175°C) for about 25-30 minutes, or until heated through. If topped with marshmallows, cover with foil to prevent burning until warmed.
- Avoid Room Temperature: It’s best to refrigerate leftovers promptly after serving to keep your sweet potato casserole safe and delicious.
Helpful Tricks for Potato Casserole
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Choose Quality Potatoes: Fresh, sweet potatoes are essential for achieving the creamy texture and natural sweetness. Avoid canned if possible; if using, drain thoroughly.
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Avoid Overcooking: Keep a close watch on the sweet potatoes while boiling. Overcooked potatoes can result in a watery filling for your potato casserole.
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Warm Ingredients Matter: Using warm milk and slightly cooled sweet potatoes when mixing contributes to a smooth, well-blended casserole.
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Layer Wisely: When assembling, ensure an even distribution of the sweet potato and filling layers for consistent flavor and texture.
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Adjust Sweetness: Taste the mixture before baking. Depending on your preference, you might want to adjust the brown sugar.
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Make Ahead: Prepare your potato casserole a day in advance and store it in the fridge. Just pop it in the oven before serving for an easy, stress-free holiday dish.
Make Ahead Options
These delightful Sweet Potato Casserole can be prepared ahead of time, making it perfect for busy holiday planners! You can peel and dice the sweet potatoes up to 24 hours in advance; just store them submerged in cold water in the refrigerator to prevent browning. Additionally, the filling mixture can be made and stored in an airtight container for up to 3 days. Assemble the casserole and cover with foil before refrigerating if you prefer this method. When you’re ready to serve, simply bake it straight from the fridge for an additional 5-10 minutes, ensuring it’s heated through and the marshmallows are perfectly toasted, resulting in a comforting dish just as delicious as when made fresh!
Variations & Substitutions for Potato Casserole
Feel free to make this delightful potato casserole uniquely your own with these fun swaps and additions!
- Nut-Free: Omit the pecans entirely or substitute with crunchy granola for a nut-free option that still adds texture.
- Dairy-Free: Use plant-based butter and non-dairy milk to keep the casserole creamy without the dairy, making it suitable for lactose intolerance.
- Fruit-Infused: Add apple slices or pear chunks for a refreshing fruit layer that complements the sweet potatoes beautifully.
- Tropical Twist: Stir in shredded coconut for a delightful tropical flair; it’ll transport you to a sunny island, even in the midst of winter.
- Spice It Up: For those who crave a bit more heat, incorporate a pinch of cayenne pepper or crushed red pepper flakes to give the dish a kick.
- Ginger Snap Topping: Swap the traditional streusel topping with crushed ginger snaps for a zingy, bold flavor that enhances the overall sweetness.
- Savory Alternative: Mix in some sautéed onions or garlic to the sweet potato mixture for those who enjoy a savory twist on classic sweetness.
If you love holiday comfort food, try pairing this casserole with a side of Cheesy Broccoli Casserole or serve it alongside classic stuffing for a balanced feast. Happy cooking!

Sweet Potato Casserole Recipe FAQs
What type of sweet potatoes should I use?
Absolutely! Fresh, peeled, and diced sweet potatoes work best for a creamy texture and natural sweetness in your casserole. If you’re in a pinch, you can substitute canned sweet potatoes; just make sure to drain them thoroughly to avoid excess moisture.
How should I store leftovers?
You can store your cooked sweet potato casserole in an airtight container in the refrigerator for up to 3-5 days. Be sure to let it cool completely before sealing to maintain its freshness and flavor. When ready to enjoy, simply reheat it in the oven.
Can I freeze the sweet potato casserole?
Very! To freeze, wrap the casserole tightly in plastic wrap, then cover it with aluminum foil. This method will keep your casserole tasty for up to 3 months! When you’re ready to serve, thaw it overnight in the fridge before reheating.
What if my mixture is too watery?
If you find that your filling is looking watery, don’t worry! Just mix in a cornstarch slurry made from equal parts cornstarch and water (about 1 tablespoon each) before baking. This will help thicken it up and achieve that perfect consistency for your sweet potato casserole.
Are there any dietary considerations for this recipe?
Definitely! If you’re cooking for someone with nut allergies, you can easily omit the pecans or substitute them with walnuts. For egg allergies, consider using an egg substitute like unsweetened applesauce or a commercial egg replacer to maintain the rich texture of the casserole.

Delightful Potato Casserole for Cozy Holiday Gatherings
Ingredients
Equipment
Method
- Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking dish.
- Toast the pecans in the preheated oven for about 5-7 minutes until fragrant and golden.
- In a pot, boil water and add the peeled and diced sweet potatoes. Cook for about 15 minutes until fork-tender.
- Mash the drained sweet potatoes in a mixing bowl until smooth.
- In a separate bowl, combine butter, brown sugar, flour, and warm milk until crumbly, then mix in spices.
- Combine the sweet potatoes with brown sugar, eggs, milk, vanilla, and spices until smooth.
- Layer half of the sweet potato mixture in the baking dish, sprinkle half of the crumbly topping, and repeat.
- Bake for approximately 30 minutes until golden and bubbly.
- Let cool for a few minutes before serving warm.

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