Brown Sugar Cinnamon Roasted Sweet Potatoes

By the time the pan comes out of the oven for its turn, the sweet potato cubes have had a head start with just olive oil and salt. The cinnamon…

By Julia • October 14, 2026 • Reading time: 7 min

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Serves 4–6

By the time the pan comes out of the oven for its turn, the sweet potato cubes have had a head start with just olive oil and salt. The cinnamon and brown sugar go on later, so the finish tastes warm and sweet without burying the potato underneath a heavy coating. These brown sugar cinnamon roasted sweet potatoes land between a simple roasted side and a lightly glazed one: tender through the middle, with a glossy coat that catches on the edges.

Light brown sugar keeps the sweetness gentle, and cinnamon makes the whole pan smell warm without needing a long ingredient list. I serve them warm, when the coating still looks shiny and the cubes hold their shape when lifted. The recipe makes six servings, which works nicely alongside a savory main or as a simple bowl on its own. It’s a straightforward way to give roasted sweet potatoes a sweet-spiced finish without turning them into a dessert.

Brown Sugar Cinnamon Roasted Sweet Potatoes with glossy golden cubes

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Kitchen Note

Keep the cubes close to 1 inch, rather than mixing tiny pieces with much larger chunks. Consistent cuts help the whole pan reach tenderness together instead of leaving a few pieces soft while others are still firm.

Save these brown sugar cinnamon roasted sweet potatoes for a glossy, tender side with a warm cinnamon finish.

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Why the Brown Sugar Goes on After the First Roast

Sweet potatoes take longer to soften than it takes sugar to darken on a hot pan. Adding the brown sugar at the beginning would leave it exposed to the full roasting time, so the coating could become too dark before the potato centers turn tender. Giving the cubes their first roast without sugar lets the potatoes do the slower part of the cooking first.

Once they’re turned, the warm surfaces help the brown sugar soften as it coats the potatoes. Cinnamon gets tossed through at the same point, so it stays fragrant instead of sitting in the oven for the entire roast. In the final stretch, watch for the change from sandy-looking sugar to a glossy coating. That finish should cling lightly to the cubes; it isn’t meant to become a thick candy shell. The order matters more than any extra fuss: roast the potatoes first, then give the sugar and spice just enough oven time to melt together.

What Each Ingredient Brings to These Cinnamon-Roasted Sweet Potatoes

Brown Sugar Cinnamon Roasted Sweet Potatoes with cinnamon sugar coating

Sweet potatoes — Choose firm potatoes without soft spots. Peeling gives the finished cubes a tender, smooth bite, and cutting them evenly helps them roast at a similar pace. There’s no need to seek out a specialty variety; the natural sweetness and texture will vary a little from potato to potato.
Olive oil — The oil coats the cubes so the salt and later seasoning can cling, while helping the surfaces roast instead of dry out. A mild neutral cooking oil can replace it in the same quantity if you’d rather not taste olive oil; the finish will be less fruity. Use fresh oil, but an expensive bottle isn’t necessary here.
Kosher salt — Salt keeps the brown sugar from making the whole dish taste one-note sweet. The recipe uses kosher salt, whose crystal size differs from fine table salt, so don’t assume spoon-for-spoon swaps will taste identical.
Light brown sugar — Its soft, packed texture helps it cling when tossed with the warm potatoes, and its mild molasses note suits the cinnamon without overpowering the vegetable. Press it into the measuring spoon so the amount is consistent; a dry, loose scoop can leave the coating less sweet than intended.
Ground cinnamon — Cinnamon supplies the recognizable warm aroma in the finish. If your jar has been open a long time and smells faint, the finished dish will taste less fragrant; a fresh, aromatic jar makes a noticeable difference without changing the method.

Roast the Cubes Before Turning Them Glossy

Start with an even layer on the rimmed sheet

Heat the oven to 425°F. Peel the sweet potatoes and cut them into cubes, then toss them with the olive oil and kosher salt right on a rimmed baking sheet. Spread the pieces in a single layer so they aren’t piled on top of one another. A crowded pan makes it harder for the heat to reach each cube evenly.

Give the potatoes their first roast

Roast the cubes for 20 minutes, then turn them over. Work around the sheet so the pieces get moved rather than just stirring the top layer. Turning gives the potatoes more even contact with the pan and prepares them for the cinnamon-sugar coating. If some cubes seem to be moving more easily than others, handle them gently so the softer ones keep their shape.

Toss on the cinnamon sugar and finish

Sprinkle the brown sugar and cinnamon over the turned potatoes, then toss until the seasoning coats the cubes. Return the pan to the oven for 5 to 8 minutes. Look for tender potatoes and sugar that has turned glossy; the cubes should still hold together when lifted. Serve them warm while that coating is at its shiniest.

Two Ways to Change the Sweetness Without Changing the Base

A less-sweet, lower-added-sugar finish

Leave out the brown sugar and let the cinnamon take over as the finishing accent. The potatoes will still roast tender, but you won’t get the sweet, glossy coating; this is a useful adjustment when you want the vegetable’s own sweetness to lead.

A deeper molasses note

Swap dark brown sugar for the light brown sugar for a richer molasses flavor. The cinnamon will still come through, but the sugar coating will taste deeper and less delicate. Keep the same late addition so the darker sugar doesn’t spend the whole roast in the oven.

Storage and Reheating

Refrigerator: Refrigerate in a covered container within 2 hours and use within 3 to 4 days. The coating will soften and lose some of its shine.
Freezer: Freeze cooled potatoes in an airtight container for up to 2 months. Thaw them in the refrigerator; the texture will be softer after freezing.
Reheating: Warm in the oven until heated through, or use short bursts in the microwave. Avoid prolonged reheating, which can dry the edges and make the coating tacky.

Questions That Come Up With These Cinnamon-Roasted Sweet Potatoes

Can I use another variety of sweet potato?+

Yes. Different varieties can vary in sweetness and color, but they work with the same seasoning. Judge doneness by whether the cubes are tender, rather than by how deeply colored they look.

Can I leave the peel on?+

You can, but the finished pieces will have a firmer, more rustic texture than the peeled version. The peel is edible; for the smooth, tender bite this dish is meant to have, peel the potatoes before cutting them.

Can I use frozen sweet potato cubes?+

Fresh sweet potatoes are the better choice here. Frozen cubes tend to release extra moisture as they roast, which can leave them softer and make it harder to get the same light, glossy coating.

Can I use table salt instead of kosher salt?+

You can, but fine table salt is denser than many kosher salts, so the same spoonful can taste saltier. Use less rather than making a direct volume-for-volume swap, and keep the seasoning light enough that the sweet potatoes still lead.