The potato skins soften as they bake, but they still need enough structure to hold a generous scoop of filling. I leave a thin layer of sweet potato inside each shell, then mash the rest with butter, brown sugar, cinnamon, salt, and milk. That little bit of care is what makes these Twice Baked Sweet Potatoes easy to fill and serve without the skins folding in on themselves.
There’s no need to peel the potatoes or fuss with a separate casserole dish. Bake them whole until very tender, let them cool just long enough to handle, and scoop the centers into a bowl. I like this method because the filling goes right back into the sweet potato skins, with miniature marshmallows on top for a golden finish.
The filling should be smooth enough to spoon but still hold its shape in the shells. A short second bake heats it through and gives the marshmallows time to turn golden, while the five-minute rest makes the potatoes easier to serve. You get tender shells, cinnamon-scented filling, and a soft toasted top in every half.
Kitchen Note
Watch the marshmallows toward the end of their bake. They should look golden, not just warm and soft, and the five-minute rest gives them a moment to settle before you serve.
Save these Twice Baked Sweet Potatoes for a cozy side dish with cinnamon-sweet filling and golden marshmallow tops.
Why Leaving Flesh in the Skins Makes Them Easier to Fill
When you scoop out a baked sweet potato, it’s easy to keep going until the skin looks clean. Resist that urge here. Leaving about a quarter inch of flesh attached gives each half a sturdier base, so it can hold the mashed filling without buckling when you spoon it back in. The shells don’t need to be perfectly hollow; that thin layer is part of what makes them work.
It also helps to use a spoon and move along the inside of the potato rather than digging at the skin. Sweet potato flesh is soft after its long bake, so you can lift it out without scraping hard. Set the shells aside as you go, and keep them together on the foil-lined baking sheet for filling. If a shell does split, it’s still usable, but handle it gently when you arrange it and add the filling.
The medium size matters for a second reason: the four potatoes need to bake until tender enough to scoop, and then leave shells large enough for a proper portion of filling. Once the centers are mashed smooth, distribute the filling among the halves rather than piling it all into one or two. Evenly filled shells are easier to arrange and bake together.
What Each Ingredient Brings to the Sweet Potato Filling
- Sweet potatoes — Choose four medium potatoes that are close in size, so they’re likely to become tender on a similar schedule. Their flesh forms the filling and their skins become the serving shells, so there’s no need to peel them. This version is built around sweet potatoes; a different kind of potato won’t give the same sweet, soft center.
- Olive oil — Rubbing the potatoes with oil before baking coats the skins. Spread it over the surface rather than leaving it in one spot, so the potatoes are evenly coated.
- Unsalted butter and milk — These soften the mashed centers and help the filling turn smooth. Unsalted butter lets the measured kosher salt stay in control. Keep the milk measured; adding extra to loosen the mash can make the filling too soft to sit neatly in the shells.
- Light brown sugar and cinnamon — Packed light brown sugar gives the filling a warm sweetness, while cinnamon rounds it out. Use fresh-smelling cinnamon if yours has been sitting in the cupboard for a long time; the aroma is a good clue to how much it will contribute.
- Kosher salt — A small amount balances the sweet ingredients and keeps the filling from tasting flat. The recipe uses unsalted butter alongside it, so swapping in salted butter without adjusting the salt would change the seasoning.
- Miniature marshmallows — The smaller size is easy to scatter over the filled halves and gives you a golden topping across the surface. Larger marshmallows won’t cover the shells in the same way, so stick with miniature ones for the intended finish.
From Tender Potato to Golden Marshmallow Top
Bake the potatoes until they give easily
Heat the oven to 400°F and line a rimmed baking sheet with foil. Pierce each sweet potato several times with a fork, rub it with olive oil, and set it on the sheet. Bake for 50 to 60 minutes, until very tender; the center should give readily when pierced. If a potato still feels firm, it needs more time before you try to scoop it.
Scoop carefully and save the shells
Let the potatoes cool for 10 minutes so they’re easier to handle. Cut each one in half lengthwise, then scoop the flesh into a medium bowl. Leave about 1/4 inch of flesh inside each skin, working gently so the shells stay intact. Set the halves on the baking sheet as you finish them.
Mash the filling until smooth
Add the butter, packed light brown sugar, cinnamon, kosher salt, and milk to the sweet potato flesh. Mash until smooth, scraping around the bowl so there aren’t firm pieces left at the bottom. If the filling looks uneven, keep mashing rather than adding more milk. Stop when it’s smooth and spoonable, not runny.
Fill, top, and bake again
Spoon the filling back into the reserved shells and arrange them on the baking sheet. Scatter the miniature marshmallows over the tops. Bake for 10 to 12 minutes, until the filling is hot and the marshmallows are golden. Let the potatoes rest for 5 minutes before serving.
Two Simple Ways to Change the Batch
A less-sweet top without marshmallows
Leave off the miniature marshmallows and bake the filled shells for the same 10 to 12 minutes, until the filling is hot. The potatoes will still have their brown sugar and cinnamon filling, but you’ll lose the toasted, pillowy topping and the finished dish will taste less sweet.
Make a half batch for two
Use 2 medium sweet potatoes, 1/2 tablespoon olive oil, 2 tablespoons unsalted butter, 2 tablespoons packed light brown sugar, 1/4 teaspoon cinnamon, 1/8 teaspoon kosher salt, 2 tablespoons milk, and 1/2 cup miniature marshmallows. Keep the baking temperatures and the potato tenderness cues the same; the potatoes still need to be very tender before you scoop them.
Storage and Reheating
- Refrigerator: Refrigerate leftovers within 2 hours and keep them covered for 3 to 4 days. The marshmallows will soften after chilling.
- Freezer: They can be frozen, though the marshmallow topping won’t be as soft and fresh after thawing. For the best texture, freeze the filled potatoes before adding the marshmallows, then thaw them in the refrigerator.
- Reheating: Warm refrigerated or thawed portions in a 400°F oven until hot throughout, adding the marshmallows for the final bake if you froze the potatoes without them. Reheat leftovers to 165°F; avoid leaving them in until the topping gets dark.
Questions That Come Up While Making Twice Baked Sweet Potatoes
Twice Baked Sweet Potatoes
Ingredients
Equipment
Method
- Heat the oven to 400°F.
- Line a rimmed baking sheet with foil.
- Pierce the sweet potatoes several times with a fork.
- Rub the sweet potatoes with the olive oil.
- Bake the potatoes on the sheet for 50 to 60 minutes, until very tender.
- Let the potatoes cool for 10 minutes.
- Cut each potato in half lengthwise.
- Scoop the flesh into a medium bowl, leaving about 1/4 inch of flesh in each skin to help the shells hold their shape.
- Add the butter, brown sugar, cinnamon, salt, and milk to the sweet potato flesh.
- Mash until smooth.
- Spoon the filling back into the potato shells.
- Arrange the shells on the baking sheet.
- Top with the marshmallows.
- Bake for 10 to 12 minutes, until the filling is hot and the marshmallows are golden.
- Let the potatoes rest for 5 minutes before serving.
