Sweet Potato With Marshmallow Cream Recipe: Gooey Roast with Crispy Top Magic

This sweet potato with marshmallow cream recipe transforms a classic side into a showstopping dessert-worthy dish—crispy edges, gooey marshmallow cream, and tender sweet potato in every bite. 🌟 The secret lies in roasting the sweet potatoes until caramelized while keeping the centers silky, then topping them with a stabilized marshmallow cream that doesn’t slide off.

I’ve perfected this technique to ensure the marshmallow layer stays creamy and cohesive, not runny or overly sweet.

What sets this recipe apart is the two-stage cooking process: first, roasting the sweet potatoes at high heat to develop that crispy crust, then blending the marshmallow cream with butter and a touch of cream for stability.

This isn’t your average side dish—it’s a restaurant-worthy centerpiece that pairs beautifully with vanilla ice cream or a scoop of whipped cream. The result is a dish that’s equally impressive as a side or dessert—think of it as a cross between sweet potato casserole and s’mores, but elevated.

The marshmallow cream adds a rich, caramelized sweetness that balances the earthy sweetness of the potatoes, while the crispy top adds a satisfying crunch. It’s the kind of dish that disappears faster than you can say “seconds, please.”

Ready in just 45 minutes, this recipe is perfect for holidays, potlucks, or a cozy weeknight treat. The best part? It’s foolproof—no fancy equipment needed, just a few simple ingredients and a little patience for the roasting. Let’s make it!

Ingredients for sweet potato with marshmallow cream

Twelve ingredients transform humble sweet potatoes into a restaurant-worthy dessert with crispy edges and gooey marshmallow magic.

The sweet potatoes are the foundation—organic, uniform size ensures even cooking. Whole Foods or local farmers markets often carry the best varieties with vibrant orange flesh. For optimal texture, look for potatoes with firm, unblemished skin. The marshmallows should be mini size for better texture distribution, and Kraft Jet-Puffed is my go-to brand for consistency. Unsalted butter is essential here—Plugrá or Land O'Lakes work perfectly, but avoid salted varieties to control seasoning.

No mini marshmallows? Regular marshmallows cut into quarters work in a pinch, though texture will differ slightly. Want to reduce sugar? Substitute maple syrup at half the amount of granulated sugar, but expect a slightly denser marshmallow cream. For extra stability in the marshmallow layer, add an extra 0.5 tbsp cornstarch if your kitchen is humid. The cinnamon and nutmeg should be freshly ground—pre-ground spices lose potency quickly. If you're serving this as a dessert, vanilla bean ice cream elevates the presentation, though any flavor works.

Store prepped sweet potatoes in the fridge for up to 2 days before roasting—they actually develop deeper flavor overnight. The marshmallow cream mixture can be made 1 day ahead and refrigerated, then reheated gently before assembly. For make-ahead convenience, pre-portion the marshmallow mixture into ice cube trays and freeze—thaw and reheat as needed. Leftovers keep for 3 days in the fridge, though the marshmallow layer may soften slightly. Reheat at 350°F for 10 minutes to restore crispiness.

Step-by-step instructions for sweet potato with marshmallow cream

Here's how to create the perfect balance of crispy sweet potato and velvety marshmallow cream.

Preheat your oven to 425°F and line a large baking sheet with parchment paper. Brush the 3 whole large sweet potatoes with 1 tablespoon extra-virgin olive oil and place them on the prepared sheet. Poke several holes in each potato with a fork to allow steam to escape.

Roast for 45-50 minutes until the skins are deep golden brown and crispy, and the flesh is tender when pierced with a knife. Real talk: the crispy skin is everything here—don't rush this step. Rotate the pan halfway through for even browning. When done, let the potatoes cool slightly before handling.

In a medium saucepan, combine 0.5 cup heavy whipping cream, 0.25 cup granulated sugar, 1 teaspoon vanilla extract, 0.5 teaspoon diamond crystal kosher salt, 1 teaspoon ground cinnamon, and 0.25 teaspoon ground nutmeg. Bring to a gentle simmer over medium heat and stir until the sugar dissolves completely.

In a small bowl, whisk together 1 tablespoon cornstarch with 2 tablespoons cold water to create a slurry. Slowly pour this into the simmering cream while whisking constantly. The mixture will thicken noticeably—keep whisking for 1-2 minutes until it reaches a smooth, pudding-like consistency. Remove from heat and stir in 0.75 cup unsalted butter until fully melted and incorporated.

Cut each roasted sweet potato in half lengthwise and carefully scoop out about ¾ of the flesh, leaving a ¼-inch thick shell. You'll have about 3 cups of sweet potato flesh total—mash this with a fork until smooth. Stir the mashed sweet potato into the marshmallow cream mixture until fully combined and creamy.

Here's the thing—this is where the magic happens. The warm sweet potato flesh will help emulsify the marshmallow cream, creating that signature gooey texture. If the mixture looks too thick, add 1-2 tablespoons warm water to achieve a smooth, spoonable consistency. Transfer the filling to a bowl and let it cool slightly while you prepare the marshmallow topping.

In a separate bowl, gently fold 2 cups large marshmallows into the remaining mashed sweet potato (about ½ cup) using a rubber spatula. You want to create soft peaks—not fully melted marshmallow. This mixture should be thick enough to hold its shape when spooned onto the sweet potatoes.

Here's the moment that matters: the marshmallow topping needs to be cool enough to hold together but warm enough to melt slightly when baked. If the mixture feels too warm, chill it in the refrigerator for 10 minutes before proceeding. This step ensures you get that perfect balance of gooey marshmallow and crispy edges.

Spoon about ½ cup of the marshmallow cream filling into each sweet potato shell, pressing down gently to create a smooth surface. Then, carefully spoon the marshmallow topping over the filling, creating a dome shape. Place the assembled sweet potatoes on a parchment-lined baking sheet.

Bake at 375°F for 12-15 minutes until the marshmallow topping is golden brown and bubbly at the edges. Watch closely—you want it to be golden, not burnt. The center should still be soft and gooey when you insert a knife. Remove from the oven and let cool for 5 minutes before serving.

Cut each sweet potato into wedges and serve immediately with a scoop of 1.5 cups vanilla ice cream on the side. The contrast of warm, gooey sweet potato with cool, creamy ice cream is what makes this dish truly special. Don't skip the ice cream—it balances the richness and adds that perfect dessert finish.

Your oven might run hot, so start checking at the 12-minute mark. If the marshmallow starts to brown too quickly, tent with foil and continue baking. The ideal serving temperature is when the marshmallow is just beginning to soften—this creates that signature "soup" effect when you cut in.

Pro cooking tips for great sweet potato with marshmallow cream

Sweet Potato Roasting Secrets

For that perfect crispy skin, I recommend using a cast iron skillet for the first 10 minutes of roasting—it gets hotter than baking sheets and creates a deeper caramelization. After transferring to the oven, rotate the potatoes quarter-turn every 15 minutes to ensure even browning.

A digital meat thermometer is your best friend here—aim for an internal temp of 200°F for tender flesh with crispy edges. 🌟

Marshmallow Cream Stability

The cornstarch slurry is non-negotiable for stability—skip it, and your marshmallow cream will turn into a runny mess. I like to whisk the slurry into the cream off-heat to prevent lumps, then return it to low heat for 30 seconds to fully activate the cornstarch.

For extra insurance, whisk in the cold butter cubes last—they help cool the mixture slightly and create a smoother texture. 🥛

Temperature Control for Baking

Your oven's accuracy matters here. If your kitchen runs hot, reduce the baking temp to 350°F for the marshmallow stage—this prevents burning while still achieving that golden-brown finish. I test doneness by inserting a knife: the center should be soft but set, with just a hint of resistance.

Overbaking by even 1 minute can turn your gooey marshmallow into a sad, dry shell. ⏰

Assembly Like a Pro

Use a small offset spatula to spread the marshmallow topping—it gives you more control than a spoon. Press the filling into the potato shells firmly to create a smooth base for the marshmallow dome.

For extra height, build the dome slightly off-center so the marshmallow has room to expand without spilling over. A quick chill in the fridge for 5 minutes before baking helps the topping hold its shape better. 🍫

Serving Presentation Tips

For restaurant-worthy plating, cut the sweet potatoes into 6 wedges per half using a sharp chef's knife. Arrange them on a platter with the marshmallow side up, then drizzle with warm caramel sauce or a sprinkle of crushed pecans for texture.

Serve immediately with ice cream—this dish tastes best when the marshmallow is still warm and gooey. 🍽️

Make-Ahead Pro Tips

Prep the marshmallow cream mixture 1 day ahead and store it in an airtight container in the fridge. Reheat gently in a microwave (30-second intervals) until just warm, then stir in fresh marshmallows before assembly.

Roasted sweet potatoes can be refrigerated for 2 days—reheat at 350°F for 10 minutes to restore crispiness before topping. 💡

Frequently asked questions