A simple combination of sweet potatoes, butter, and cinnamon topped with chopped walnuts and the classic mini marshmallows is elevated by preparing it on the smoker for an added smoky flavor that can’t be beaten.
Sweet potato casserole is a simple dish to make and you can prepare it up to three days in advance and store it in the fridge until you are ready to cook it. We love a good do-ahead recipe, especially around holiday time.
Sweet Potato Marshmallow Casserole
Sweet potato casserole is a popular Thanksgiving dish that you will find on many American Thanksgiving tables.
Sweet Potato Casserole originated in the South and can be found in cookbooks dating back as early as 1917.
Popular restaurants like Ruth’s Chris Steakhouse keep the sweet dish on their menu year-round, but it is most commonly served as a Thanksgiving side dish.
I love cooking it on the smoker. You free up space in your oven and kitchen for all of your other great Thanksgiving dishes!
How to Make Smoked Sweet Potato Casserole
1. Prep the sweet potatoes
The first step is to peel your sweet potatoes either with a vegetable peeler or a paring knife.
Once your sweet potatoes are peeled, you want to chop them into cubes. A rough chop is fine, you don’t need to worry too much about making them perfectly even. You want to aim for cubes about 1” in size so they all cook evenly.
Bring a pot of water to a boil and add your cubed sweet potatoes. Cover them and let them simmer for about 20 minutes until they are fork-tender.
Once they are soft, you can strain them into a colander and then just dump them back into the same pot you boiled them in.
2. Add some flavor
Add the butter, brown sugar, vanilla extract, salt, pepper, and cinnamon to the pot with the sweet potatoes. With a potato masher give them a good mash until there are no lumps and all the ingredients are well incorporated.
Transfer the mashed sweet potato to a casserole dish or aluminum tray.
Sprinkle the top with chopped walnuts and a layer of marshmallows.
3. Fire up the smoker
Preheat your smoker to 350°F.
You can cook this recipe on any smoker or grill you prefer, as long as it can maintain a steady temperature of 350°F. I smoked this recipe on my Masterbuilt Gravity Series 1050 smoker. I love this grill for recipes like this because it has an internal fan that can maintain temperature with little-to-no effort on my part.
Fill the grill with your favorite lump charcoal, I used the B&B Charcoal Oak Lump for this recipe. I like oak lump charcoal because it burns really evenly and provides a subtle smoky flavor that won’t overpower the dish.
Once your grill is up to temperature, you can place the sweet potato casserole directly on the grates.
Because the sweet potatoes have already been pre-cooked, the smoking process for this recipe does not take long.
You want to let it smoke at 350°F for around 25 to 30 minutes, or until the tops of the marshmallows just start to brown.
Once the marshmallows are brown, you can remove the casserole from the smoker and it’s ready to serve immediately alongside your favorite Thanksgiving dishes.
What to serve with Smoked Sweet Potato Casserole?
This casserole is the perfect side for your Thanksgiving dinner – here are some great Thanksgiving recipes to serve with your Smoked Sweet Potato Casserole:
- Smoked Turkey
- Smoked Turkey Wings
- Smoked Texas-style Turkey Breast
- Smoked Green Beans
- Twice Smoked Spiral Ham with Pineapple Maple Glaze
- Double Smoked Ham with Maple-Mustard Glaze
Smoked Sweet Potato Casserole
- 3 lbs sweet potato
- ¾ cup light brown sugar
- 1 stick butter unsalted
- 1 tsp vanilla extract
- ½ tsp ground cinnamon
- ½ tsp Kosher salt
- ½ tsp black pepper
- 1 cup walnuts chopped
- 2 cups miniature marshmallows
- Preheat your smoker to 350°F.
- Peel your sweet potatoes, then rough-chop into 1” cubes.
- Bring a large pot of water to boil and add your cubed sweet potatoes to the water and let them boil for 20 minutes until fork tender.
- Strain the sweet potatoes into a colander and return them to the same pot that you boiled them in.
- Add the butter, brown sugar, vanilla extract, cinnamon, kosher salt, and black pepper to the pot.
- Using a potato masher, mash the sweet potatoes until they reach a smooth consistency and the ingredients are fully-combined.
- Transfer the mashed sweet potatoes to a casserole dish or aluminum tray and smooth out the top with the back of a spoon.
- Sprinkle the chopped walnuts over the top, then add an even layer of mini marshmallows that fully covers the top of the casserole.
- Place your casserole directly on the grates
- Let it smoke for 25 to 30 minutes until the tops of the marshmallows start to turn brown.
- Remove from the smoker and serve immediately.