Marshmallow Recipe Sweet Potato Casserole: Golden Topping With Velvety Layers

This casserole transforms sweet potatoes into a velvety base topped with golden marshmallows that toast to perfection.

Baked at 375°F until bubbling, it’s a vegetarian-friendly dish that balances sweetness and savory depth in every bite.

Ingredients for Marshmallow Recipe Sweet Potato Casserole

Sweet potatoes, warm spices, and a cloud of golden marshmallows create this crowd-pleasing casserole.

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The sweet potatoes are the foundation—choose firm, orange-fleshed varieties like Beauregard or Jewel. Whole Foods or Trader Joe’s consistently stock high-quality tubers. For the marshmallows, Jet-Puffed mini marshmallows melt beautifully and toast evenly. The evaporated milk adds richness; Carnation brand is reliable. Avoid canned sweet potatoes, as they lack the texture needed for that velvety base.

Need to swap the pecans? Walnuts or almonds work just as well for crunch. Out of evaporated milk? Half-and-half reduced by half (simmer 1 cup to 1/2 cup) is a solid substitute. For a deeper spice profile, add one-quarter teaspoon ground ginger. The brown sugar can be omitted if you prefer less sweetness, but it adds a caramelized depth to the topping.

Assemble the casserole up to a day ahead—cover and refrigerate. Bake straight from the fridge, adding 10-15 minutes to the cooking time. Leftovers keep for 4 days in the fridge or freeze for 3 months. Reheat covered to prevent the marshmallows from over-browning (worth the extra minute).

Step-by-Step Instructions for Marshmallow-Topped Sweet Potato Casserole

This method ensures a velvety base with a perfectly golden marshmallow topping every time.

Step 1: Roast and Mash the Sweet Potatoes

Preheat your oven to 400°F. Peel the 4 lb Sweet Potatoes and cut them into 1-inch cubes for even cooking. Toss them with 2 tablespoons of the 0.5 cup Unsalted Butter, then spread in a single layer on a rimmed baking sheet.

Roast for 25-30 minutes, stirring once halfway, until the cubes are fork-tender and beginning to caramelize at the edges. Transfer the hot potatoes to a large bowl and mash until smooth. The natural sweetness will intensify during roasting.

Step 2: Prepare the Spiced Sweet Potato Base

To the mashed sweet potatoes, add the remaining 0.5 cup Unsalted Butter (melted), 0.75 cup Granulated Sugar, 2 tsp Vanilla Extract, 1.5 tsp Ground Cinnamon, 0.5 tsp Ground Nutmeg, and 1 tsp Salt. Mix thoroughly to combine.

In a separate bowl, whisk the 2 whole Large Eggs with the 1 can Evaporated Milk until fully incorporated. Gradually stir this mixture into the sweet potato base. The eggs will bind the casserole while the evaporated milk adds richness without thinning the texture.

Step 3: Assemble and Bake the Casserole Base

Transfer the sweet potato mixture to a greased 9×13-inch baking dish and spread it into an even layer. Bake at 350°F for 25-30 minutes until the edges are set and the center is just slightly jiggly.

This initial baking step ensures the base is fully cooked before adding the topping. The surface should look matte rather than glossy when it’s ready for the next layer. Remove from the oven and let it sit while you prepare the topping.

Step 4: Add the Marshmallow and Pecan Topping

In a bowl, combine the 4 cups Mini Marshmallows, 0.25 cup Light Brown Sugar, and 0.5 cup Pecans. Sprinkle this mixture evenly over the baked sweet potato base, pressing down lightly so the marshmallows adhere.

Return the dish to the 350°F oven and bake for 10-12 minutes until the marshmallows are golden brown with some darker toasted spots. For extra color, broil for 1-2 minutes at the end, watching constantly to prevent burning.

Step 5: Rest and Serve

Remove the casserole from the oven and let it rest for 10 minutes before serving. This allows the layers to set slightly, making it easier to portion. The marshmallows will soften but maintain their structure during this time.

Serve warm, ensuring each portion includes both the creamy sweet potato base and the toasted marshmallow topping. The contrast between the velvety casserole and the crispy, gooey topping is what makes this dish unforgettable.

Essential Equipment for Great marshmallow recipe sweet potato casserole

Baking Dish Essentials

I always reach for my 9×13-inch glass baking dish—Pyrex is my go-to brand for even heat distribution. A 3-quart capacity is perfect for this recipe’s volume. Avoid metal pans as they can cause the edges to overcook before the center sets properly.

Mixing Tools

A sturdy potato masher makes quick work of the sweet potatoes. I use an OXO Good Grips masher with a comfortable handle. For the wet ingredients, a large mixing bowl with a pour spout helps prevent spills when combining the egg and milk mixture.

Measuring Accuracy

Precision matters with the spices. I keep a set of stainless steel measuring spoons from Cuisinox for the cinnamon and nutmeg. For the sugars, a 1-cup dry measuring cup ensures you get the exact amounts needed for that perfect sweetness balance.

Oven Thermometer

Don’t trust your oven’s built-in thermometer. I place an oven-safe thermometer (Taylor Precision is reliable) on the rack to monitor the actual temperature. This ensures your casserole bakes at the precise 350°F needed for even cooking. 🌡️

Topping Distribution

An offset spatula helps spread the marshmallow mixture evenly over the base. I also keep a small bowl handy for mixing the topping ingredients. The spatula’s thin edge lets you press the marshmallows gently into the base without squishing them.

Serving Utensils

A large serving spoon with a sharp edge makes portioning easy. I love my Zyliss spoon that cuts through the marshmallow topping cleanly. Serve directly from the baking dish—this casserole looks as good as it tastes when presented family-style. 💛

Frequently Asked Questions