Oven Roasted Sweet Potatoes

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Oven roasted sweet potatoes with a caramelized crust of flavor. The trick to nailing the perfect taste and texture is easier than you think. Just grab a roll of foil because it’s going to be a game-changer.

Oven Roasted Sweet Potatoes

Oven roasted potatoes is a simple side dish with just a few simple ingredients. The thick rounds of tubers are first tossed in olive oil and savory seasonings. It’s essential that the vegetable is consistent in shape for even cooking.

Covering the slices for the first part of cooking steams the interiors, creating a creamy texture. The final step is to remove the foil to develop the most delicious naturally sweet, slightly crisp crust. The contrasting textures will have everyone raving about.

Sweet potatoes

How to roasted sweet potatoes

  • Line a large baking sheet with foil and grease with oil.
  • Wash and peel sweet potatoes, then cut into ¾-inch rounds.
  • Toss sweet potatoes with olive oil and seasonings.
  • Place potatoes in a single layer on the baking sheet.
  • Cover potatoes with foil.
  • Bake at 425ºF (218ºC) for 30 minutes.
  • Remove foil and bake until the bottoms are golden brown.
  • Flip the potatoes and bake until golden brown on both sides.
  • Cool for 10 minutes, then serve, garnish with thyme.

Perfecting the cut

The easiest way to ensure that the sweet potatoes are cooked consistently, void of undesirable burnt edges, is to cut them into cylindrical pieces. These types of potatoes contain more sugar than typical spuds, so preventing charring is critical.

As long as the thickness is the same from piece to piece, the diameter of the potato can range without much impact on the final taste and texture. A round shape, about ¾-inches thick, provides just the right ratio of creamy interiors to a beautiful golden crust.

circular slices of sweet potatoes on a foil-lined baking sheet

Should the sweet potatoes be peeled?

Yes! Sweet potatoes have a relatively thin outer skin which can be eaten when roasted. However, caramelization will not occur around the entire potato with the skin left on. For the best eating experience, pull out the peeler when roasting smaller pieces. I prefer to leave the skin on when making whole baked sweet potatoes.

Keep the seasonings simple

To accentuate the candied like flavor inherent in sweet potatoes, all that’s needed is garlic powder, salt, and pepper. A toss in olive oil adds a touch of earthiness while preventing some sticking to the pan. The oil also helps the crust form more effectively towards the end of cooking.

Don’t preheat the oven!

The key to coaxing out more sweetness from the potatoes is to start cooking them in a cold oven. This may sound strange but it comes down to the conversion of starch to sugars.

The goal is to gradually increase the internal temperature of the flesh to allow more sugars to be created. According to Cook’s Illustrated, this change occurs between 135 to 175ºF (57 to 79ºC) and halts past that limit.

By heating the oven to 425 degrees and progressively elevating the temperature guarantees sweeter spuds. Imagine shoving the baking sheet in an already screaming hot oven, the starches would stick around instead of change. I noticed that after about 30 minutes of roasting, the potatoes already hit the upper limit, were soft and honeyed.

roasted sweet potatoes with darken char

Cover and steam

To extend the sugar conversion process, cook the sweet potatoes tightly covered in foil. This steams them by releasing moisture from their cell walls as they cook. This process eliminates the need to parboil the sweet potatoes before roasting. In 30 minutes they will soften, but the texture is underwhelming. It’s time for the last phase!

Then uncover and roast

Once the starches convert to a mix of sucrose, fructose, glucose, and maltose from the steaming process. Exposing the slices to the dry heat towards the end of cooking elevates the surface temperatures.

Any sucrose present will begin to caramelize between 320 to 350ºF (160 to 177ºC) and form a wonderful crust. Those caramelized sugars will slightly harden as it cools down, which makes each bite a little bit crisp.

I serve this with

serving platter of roasted sweet potato side dish

Watch for the caramelization

The most simple cue is visual change. The surface will go from bright orange to golden brown and look drier. It will be glossy and feel slightly sticky. It’s important to keep an eye on the potatoes as they are flipped. Beyond 350ºF (117ºC), sugars quickly turn deep amber color to a blackened appearance with a burnt flavor.

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Oven Roasted Sweet Potatoes

Oven roasted sweet potatoes with a caramelized crust of flavor. The trick to nailing the perfect taste and texture is easier than you think.
Pin Print Review
4.12 from 18 votes
Prep Time20 mins
Cook Time1 hr 10 mins
Total Time1 hr 30 mins
Servings 8 servings
Course Side
Cuisine American

Ingredients

  • 3 pounds sweet potatoes
  • 2 tablespoons olive oil
  • 1 teaspoon kosher salt
  • ¼ teaspoon garlic powder
  • ¼ teaspoon black pepper
  • 1 teaspoon chopped thyme

Instructions 

  • Line a large baking sheet with foil. Grease with olive oil, spreading into an even layer to prevent sticking.
  • Wash and peel the sweet potatoes, trim off the ends and cut into ¾-inch thick rounds.
  • In a large bowl evenly coat the sweet potatoes with olive oil.
  • Sprinkle with salt, garlic powder, and black pepper, stir to combine.
  • Add potatoes to the baking sheet in one single layer, and tightly cover cover with foil.
  • Set the oven rack to the center position. Place the potatoes inside and heat to 425ºF (218ºC).
  • Roast the potatoes for 30 minutes then carefully remove the top layer of foil and discard.
  • Return the potatoes to the oven and roast until the bottoms turn golden brown, about 15 to 25 minutes.
  • Remove the potatoes from the oven and carefully flip over. Roast until the top and bottoms are golden brown, 10 to 15 minutes.
  • Cool for 10 minutes on the sheet pan before transferring to a serving platter.
  • Garnish with chopped thyme and serve warm.

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Nutrition Facts
Oven Roasted Sweet Potatoes
Amount Per Serving
Calories 178 Calories from Fat 36
% Daily Value*
Fat 4g6%
Saturated Fat 1g5%
Sodium 384mg16%
Potassium 573mg16%
Carbohydrates 34g11%
Fiber 5g20%
Sugar 7g8%
Protein 3g6%
Vitamin A 24132IU483%
Vitamin C 4mg5%
Calcium 51mg5%
Iron 1mg6%
* Percent Daily Values are based on a 2000 calorie diet.

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Jessica Gavin

I'm a culinary school graduate, cookbook author, and a mom who loves croissants! My passion is creating recipes and sharing the science behind cooking to help you gain confidence in the kitchen.

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14 Comments Leave a comment or review

  1. Lucie says

    I tried the recipe yesterday and it was very good. Best sweet potatoes recipe !!
    They burned a little but was still pretty good I will do this recipe again. I will just be more careful with the cooking 👍🏻

  2. Lynette says

    Thanks for sharing this roasting tip. It’s a great way to bring out the natural sweetness! I tried lining the sheet with foil to make for easy clean up; I would not do that again because it made flipping the potatos more difficult and some of the yummy carmelization stuck to the foil.

  3. Katie says

    These were soooo good! Had sliced them thinner before I found the recipe but tried the technique of starting them in a cold oven and it really worked to get that creamy interior texture with a caramelized exterior. Tasked like candy with just the natural sugars from the sweet potato. Thanks for this classic recipe!

  4. Fireo says

    Hi, the 30 mins start when the oven reaches the 425oF or since we place them I n the oven? Thanks!

    • Jessica Gavin says

      The oven is not preheated for this recipe. Add the potatoes to the oven, then heat it to 425, cook for 30 minutes. Continue to roast as directed in the instructions.

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