Bake sliced sweet potatoes or canned yams with a butter and brown sugar glaze, then top with marshmallows and broil until golden for a classic.
Southern holiday tables have a sweet spot for this dish, but the name causes confusion. Most cans labeled “yams” in the US are actually a variety of sweet potato. The marshmallow topping became a staple in the mid-20th century when a company selling both candied yams and marshmallows printed recipes combining them.
The result is a sweet, caramelized side that works alongside ham, turkey, or roast chicken. Whether you use fresh sweet potatoes or a shortcut with canned yams, the technique matters more than the debate over what to call them. This guide walks through the methods, temperatures, and small adjustments that make the difference.
Why Starting With Fresh or Canned Matters
Canned yams are already cooked and packed in a light syrup. They save time but tend to be softer and can turn mushy with extended baking. Fresh sweet potatoes hold their shape better and absorb the glaze differently.
Many recipes suggest fresh for a firmer, more structured dish. If you go that route, wash, peel, and slice them into rounds about half an inch thick. Parboil the slices in water until just fork-tender — roughly 10 to 15 minutes — before assembling the casserole. This step prevents undercooked centers in the final bake.
Canned yams simply need draining and a shorter oven time. Toss them in the glaze, bake until heated through, then add the marshmallows. The trade-off is convenience versus texture control.
| Yam Type | Prep Work | Best For |
|---|---|---|
| Fresh sweet potatoes (sliced rounds) | Peel, slice, parboil 10-15 minutes | Firmer texture, caramelized edges |
| Canned yams (in syrup) | Drain well, skip boiling | Quick assembly, softer bite |
| Fresh sweet potatoes (mashed) | Boil whole, peel and mash with butter and sugar | Creamy, souffle-like texture |
| Canned yams (mashed) | Drain and mash directly | Fastest mashed variation |
| Fresh sweet potatoes (cubed) | Peel and cube 1-inch, roast before glazing | Caramelized surface area |
Why Timing the Marshmallow Addition Matters Most
Marshmallows are mostly sugar and gelatin. They melt quickly, and if they sit in a hot oven too long, they dissolve into a sticky puddle or burn around the edges. The goal is a golden, toasted top with a soft interior.
- Add late in baking: Place marshmallows during the final 5 to 10 minutes of oven time. This gives them enough heat to soften and brown without melting away.
- Broil for color: After baking, switch the oven to broil for 1 to 2 minutes. Watch closely — marshmallows can go from pale to charred in seconds.
- Cover before marshmallows: If using a 350°F method, cover the dish with foil for the initial bake. The foil traps steam and cooks the yams through. Uncover and finish uncovered before adding marshmallows.
- Use mini or full-size: Mini marshmallows cover more surface area and toast evenly. Full-size marshmallows create larger, more dramatic toasted spots.
- Broil position matters: Place the dish on the top rack, about 4 to 6 inches from the broiler element, for fast, even browning.
Taking marshmallows off early also means the brown sugar glaze underneath stays glossy and doesn’t burn. The two layers — glazed yams and toasted marshmallows — depend on separate cooking windows.
Oven Temperature and the Glaze Base
The choice of oven temperature affects how the brown sugar and butter mixture caramelizes. A common method uses 375°F for a balance of gentle cooking and surface browning. For canned yams, 30 minutes at this temperature works after tossing them in the sauce.
Another tested option is 350°F, especially for fresh yams that need longer to soften. Cover the dish with foil and bake for 15 minutes, then uncover and bake for another 20 minutes before adding the marshmallows. The 350 degree baking method gives the sweet potatoes time to absorb the glaze without over-reducing the liquid.
For a deeper caramelized finish, some recipes use 400°F. Combine brown sugar and cinnamon in a small bowl, sprinkle over the buttered yams, and bake uncovered. Higher heat speeds up the process but requires checking to prevent burning.
| Temperature | Approach | Marshmallow Timing |
|---|---|---|
| 350°F (175°C) | Cover with foil first, then uncover | Add after 35 minutes, bake 5-10 more |
| 375°F (190°C) | Uncovered, shorter bake for canned | Add after 20-25 minutes, bake 5-10 more |
| 400°F (200°C) | Uncovered, watch glaze closely | Add after 15-20 minutes, bake 5 more |
Regardless of temperature, the glaze follows a simple formula. Melt butter with brown sugar — about 4 tablespoons of butter and half a cup of brown sugar for a standard 40-ounce can of yams. Stir until the sugar dissolves and the mixture comes together. A splash of vanilla extract and a pinch of cinnamon round out the classic flavor.
How to Layer the Dish for Best Results
The order of ingredients in the casserole dish changes how the flavors distribute. Start with a layer of yams on the bottom, then spoon half the brown sugar mixture over them.
- Bottom layer of yams: Spread an even bed of parboiled fresh slices or drained canned yams. Crowding the dish is fine as long as the layer is fairly even.
- Half the glaze: Spoon half the butter-brown sugar mixture over the first layer. Dot with small pieces of additional butter if you want extra richness.
- Second layer of yams: Arrange the remaining yams on top. Tuck any smaller pieces into gaps so the surface is relatively flat for the marshmallow topping.
- Remaining glaze: Pour the rest of the glaze over the top layer. Tilt the dish to distribute it evenly.
- Final bake and marshmallows: Bake according to your chosen temperature. Add marshmallows at the end, then broil to finish.
For a mashed variation, cook the yams until very tender, then mash them directly in the dish with the butter and brown sugar. Stir in a tablespoon of maple syrup if you want extra sweetness, then top with marshmallows and toast.
Flavor Twists and Texture Add-Ons
The basic combination of yam, butter, brown sugar, and marshmallow is a classic for a reason. But small additions can shift the dish toward something more complex. A splash of orange juice stirred into the brown sugar mixture brightens the sweetness and cuts through the richness.
One blog’s Orange juice flavor addition uses about two tablespoons of juice for a standard can of yams. The acidity balances the brown sugar and pairs well with the marshmallow topping.
For texture, chopped pecans or walnuts add crunch. Sprinkle them over the yams before adding the marshmallows, or mix them into the pecan topping for a dual-layer effect. A teaspoon of cinnamon or a quarter teaspoon of nutmeg in the glaze adds warmth. Vanilla extract is the most common finishing touch, but a drop of almond extract provides a subtle twist.
The Bottom Line
Cooking yams with marshmallows and brown sugar comes down to three decisions: fresh or canned yams, your oven temperature, and when you add the marshmallows. Fresh yams need parboiling and a longer bake for a firmer texture. Canned yams work as a fast shortcut. Add marshmallows in the last few minutes and broil for the golden top that defines the dish.
Whether you stick with the classic trio or add orange juice and pecans, the dish comes together in under an hour. Taste a slice of yam from the middle of the dish before adding marshmallows — if it needs more salt or sweetness, that’s your last chance to adjust before the topping goes on.
References & Sources
- Couponclippingcook. “Candied Yams with Pecans and Marshmallows” An alternative baking temperature is 350°F (175°C).
- Feelslikehomeblog. “Candied Yams with Marshmallows” For extra flavor, add a splash of orange juice to the butter and brown sugar sauce before tossing with the yams.