Parmesan Herb Roasted Sweet Potatoes

The best part of roasting sweet potatoes is the way their cut edges turn a little crisp while the centers soften. I like that contrast here, with Italian seasoning for a savory note and Parmesan bringing a salty, browned finish. These Parmesan herb roasted sweet potatoes make a straightforward side dish from a short list of ingredients, without needing a sauce or a complicated prep.

Cutting the potatoes into even 1-inch cubes gives them a fair chance to finish at the same time. I take a moment to spread them out instead of piling them together; a crowded pan can leave the pieces soft rather than browned. The Parmesan goes on partway through, so it has time to color without spending the entire roast in the oven.

Once they’re out of the oven, the edges are browned and the centers give easily to a fork. The little savory Parmesan crust against the sweet, tender potato is what makes this simple tray worth repeating.

Why the Parmesan Goes on After the First Roast

Parmesan needs less time in the oven than a cube of sweet potato needs to turn tender. If the cheese goes on at the beginning, it sits through the full roast and can become too dark before the potatoes are ready. Adding it after the first 20 minutes gives the potatoes a head start, then lets the cheese brown during the shorter final stretch.

That timing also gives you a chance to turn the potatoes before the cheese goes on. The bottom-facing sides get moved, and the Parmesan can be sprinkled over the exposed surfaces rather than disappearing onto the parchment. Spread it as evenly as you can; a few bare spots are fine, but one thick pile of cheese won’t brown as evenly as a light coating across the tray.

Keep an eye on the final stretch instead of relying on the clock alone. The potatoes are ready when a fork pierces them easily and their edges are browned. Since cubes can vary a little in moisture and size, those cues tell you more than the timer by itself.

What the Sweet Potatoes, Herbs, and Parmesan Each Bring

• Sweet potatoes — Choose firm potatoes without soft spots, since the flesh needs to hold its shape as it roasts. Peeling gives the finished cubes a consistent tender bite. White-fleshed sweet potatoes also work in this recipe, though they tend to taste less sweet than orange-fleshed ones.
• Olive oil — The oil coats the pieces so the seasoning clings and the surfaces roast instead of drying out. A basic everyday olive oil is a good fit; there’s no need to use a special finishing oil here.
• Italian seasoning — This dried herb blend spreads its flavor across the tray without requiring fresh herbs or extra prep. Check that the blend smells fragrant when you open it; an old, faded jar won’t contribute as much.
• Finely grated Parmesan — Fine shreds distribute more evenly over the cubes than thick shavings and form a delicate browned coating. Freshly grated Parmesan works well, and a finely grated packaged version is convenient when that’s what you have.
• Kosher salt and black pepper — They balance the potatoes’ sweetness and round out the herb-and-cheese seasoning. Parmesan is already salty, so keep the measured salt in proportion rather than adding extra by instinct.

Roasting the Sweet Potatoes Without Losing the Browned Edges

Heat the oven and prepare the tray

Heat the oven to 425°F and line an 18×13-inch rimmed baking sheet with parchment paper. Starting with a hot oven helps the outside of the cubes roast while the centers soften. The rim keeps the potatoes contained when you turn them, and parchment makes it easier to lift the finished pieces off the tray. Have the pan ready before you season the potatoes so they can go straight into the oven.

Coat the cubes and leave room between them

Put the peeled, cubed sweet potatoes in a large bowl with the olive oil, Italian seasoning, kosher salt, and black pepper. Toss until the pieces have a light, even coating and you don’t see dry seasoning collecting at the bottom of the bowl. Spread them in a single layer on the prepared pan. If pieces are touching here and there, that’s all right; avoid piling them on top of one another.

Roast first, then turn and add the cheese

Roast the potatoes for 20 minutes before turning them. Use a spatula to move the pieces around so the sides that were against the pan face up. Sprinkle the finely grated Parmesan evenly over the potatoes after turning, aiming for a light layer rather than a mound in the center of the tray. The potatoes will still be firm at this point, so handle them gently but don’t wait for them to be fully tender before adding the cheese.

Finish until the centers are tender

Return the pan to the oven for another 10 to 15 minutes. Look for browned edges and test a few of the larger cubes with a fork; it should pass through the center without resistance. If a piece is still firm, give the tray more time within that final roasting window and check again. The Parmesan should look lightly browned in places, not scorched.

Two Useful Ways to Adapt the Tray

Questions That Come Up While Making These Sweet Potatoes

Parmesan Herb Roasted Sweet Potatoes

Parmesan herb roasted sweet potatoes are tossed with olive oil and Italian seasoning, then roasted until tender with browned edges. A final sprinkle of finely grated Parmesan adds a savory, crisp finish.

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Prep Time 10 minutes mins

Cook Time 35 minutes mins

Total Time 45 minutes mins

Servings: 4 servings

Course: Side Dish

Cuisine: American

Calories: 310

Ingredients Equipment Method Notes

Ingredients

  

• 2 lb sweet potatoes peeled and cut into 1-inch cubes
• 2 tbsp olive oil
• 1 tsp Italian seasoning
• 0.5 tsp kosher salt
• 0.25 tsp black pepper
• 0.5 cup Parmesan cheese finely grated

Equipment

• 1 18x13-inch rimmed baking sheet

Method

 

1. Heat the oven to 425°F and line an 18x13-inch rimmed baking sheet with parchment paper.
2. Toss the sweet potatoes with the olive oil, Italian seasoning, salt, and pepper in a large bowl, then spread them in a single layer on the prepared baking sheet.
3. Roast for 20 minutes, then turn the potatoes and sprinkle them evenly with the Parmesan.
4. Roast for another 10 to 15 minutes, until the potatoes are tender when pierced with a fork and browned at the edges.

Notes

For even browning, spread the sweet potatoes in a single layer without crowding the pan. Refrigerate leftovers for up to 4 days; freezing is not recommended because the potatoes can soften. For a dairy-free option, use a dairy-free Parmesan-style cheese.