Comfort Food
Roasted Purple Sweet Potatoes (Easy Oven-Roasted Side Dish)
Prep
10 minutes
Cook
30 minutes
Yield
4
These roasted purple sweet potatoes are crispy on the outside, tender on the inside, and tossed with olive oil, fresh herbs, and lemon for a bright, flavourful finish. This easy purple sweet potato recipe makes the perfect colourful side dish for bowls, roasted meats, or weeknight dinners.
Roasted Purple Sweet Potatoes are one of those side dishes that look fancy but are ridiculously easy to make. They roast up crispy on the outside, soft on the inside, and that deep purple color is absolutely stunning on any table spread or plate. This simple Purple Sweet Potato Recipe uses just a handful of ingredients and finishes with fresh herbs and lemon for the kind of flavour that makes people ask for seconds.
Why You’ll Love This Recipe ❤️
- Absolutely gorgeous colour: The vibrant purple interior makes this one of the most eye-catching roasted vegetable dishes you can put on the table.
- Perfect texture: High-heat roasting gives you golden edges with soft, tender centers. The perfect potato consistency, if you ask me.
- Simple 5-ingredient prep: Olive oil, salt, pepper, and a few fresh toppings are all you need.
- Naturally vegan & gluten-free: A perfect side for almost any meal (and great for meal prep too).
What Are Purple Sweet Potatoes
Purple sweet potatoes look intimidating, but they’re actually just another variety of sweet potato with their own unique flavor and texture. Compared to regular orange sweet potatoes, like the ones used in these Maple Sesame Roasted Sweet Potatoes, purple varieties are denser, less sweet, and slightly nuttier. Instead of that candy-sweet flavor you get with orange potatoes, purple ones lean more earthy and subtle, which makes them fantastic in savory dishes.
The most common variety in North America is Stokes Purple, which has dark purple-brown skin and deep violet flesh that stays vibrant after cooking. You may also find Okinawan sweet potatoes, which have tan skin and purple flesh. These are slightly creamier but work well for oven-roasted purple sweet potatoes too.
And just to clear up a common mix-up: purple sweet potatoes are not ube. Ube is a purple yam from the Philippines and has a different texture and sweetness level.
Fun Fact: Purple sweet potatoes get their color from anthocyanins, the same antioxidant compounds found in blueberries and red cabbage. These pigments are water-soluble and can shift slightly depending on pH and cooking method, which is why the flesh sometimes looks deep violet and sometimes more blue-purple after roasting.
Ingredients You’ll Need
This Purple Sweet Potato Recipe keeps things simple, but every ingredient plays a role.
Purple Sweet Potatoes
Look for Stokes Purple if you can find them, as mentioned above; they roast beautifully and keep their color well. You’ll usually find them at Whole Foods, Sprouts, farmers’ markets, and sometimes Trader Joe’s.
Olive Oil
Extra-virgin olive oil helps the potatoes caramelize and crisp while adding flavour. Coconut oil also works if you want a subtle sweetness.
Salt and Pepper
Classic seasoning that lets the natural flavor shine.
Optional Seasonings
Garlic powder, smoked paprika, or fresh herbs, like rosemary and thyme, add extra depth.
Fresh Garnishes
Parsley, green onions, lemon zest, and a squeeze of lemon brighten the whole dish.
One thing you might notice when cutting purple sweet potatoes is a white sap that oozes out. Totally normal! It’s just a mix of starch and sugar, and the more sap you see, the sweeter the potato tends to be.
How to Pick the Best Purple Sweet Potatoes
When shopping for purple sweet potatoes, keep it simple. Look for potatoes that feel firm and heavy for their size, with smooth skin and no soft spots or sprouting. Heavier potatoes generally have more moisture inside, which means better texture once roasted.
The skin colour can also help identify the variety:
- Stokes Purple: deep purple-brown skin
- Okinawan: tan or beige skin with purple flesh inside
They’re easiest to find from fall through early spring, but many grocery stores are starting to carry them year-round as they become more popular.
Tips for the Best Roasted Purple Sweet Potatoes
If you’re wondering how to roast purple sweet potatoes so they’re perfectly crispy, these small details make a big difference.
Cut Evenly
Aim for ¾–1 inch cubes so everything cooks at the same speed. Smaller cubes crisp more, where larger cubes stay creamier inside.
Don’t Overcrowd the Pan
Spread them in a single layer with space between pieces. If the pan is packed, they’ll steam instead of roast.
Use High Heat
Purple sweet potatoes are denser than orange varieties. Roasting at 400–425°F helps develop crispy edges while keeping the inside creamy.
Season After Roasting
Salt draws out moisture, so adding some seasoning right after they come out of the oven keeps the texture crisp.
Preheat Your Baking Sheet
An optional pro tip: placing potatoes on a hot sheet pan jumpstarts the crisping on the bottom.
Skin On or Off
The skin adds texture and nutrients. If the skins look rough or warped, go ahead and peel.
Fun Fact: Purple sweet potatoes are starch-forward and lower in moisture than orange varieties. High heat converts surface starches into a crispy outer shell while the inside steams gently from its natural moisture (giving you that perfect contrast).
Flavor Variations
This is one of those dishes you can customize endlessly. Potatoes, including these Purple Sweet Potatoes, are so versatile and forgiving. Here is some inspo you can try out in your kitchen:
Mediterranean Style
Roast with olive oil and oregano, then finish with lemon zest and crumbled feta or a spoonful of whipped feta.
Warm Spice
Use coconut oil with cinnamon and smoked paprika, then drizzle with maple syrup.
Savory Garlic Herb
Roast with olive oil, rosemary, thyme, and a few whole garlic cloves.
Spicy Kick
Toss with chili powder or Aleppo pepper and finish with fresh lime juice.
What to Serve with Roasted Purple Sweet Potatoes
These roasted purple sweet potatoes work with almost everything. Here are some serving suggestions:
As a side dish
Serve alongside roasted chicken, grilled steak, lamb, or fish.
In grain bowls
Add them to bowls with quinoa, farro, or couscous, greens, and a tahini drizzle.
With dips
They’re amazing dipped into tzatziki, whipped feta, hummus, or tahini.
With other roasted veggies
Pair them with roasted Brussels sprouts or baked carrots for a colourful veggie spread.
For meal prep
Roast a big batch on Sunday and add them to salads, wraps, or grain bowls all week.
How to Store and Reheat
Fridge
Store roasted purple sweet potatoes in an airtight container for 3–4 days.
Freezer
Spread them on a sheet pan to freeze first, then transfer to a freezer bag. They’ll keep for up to 3 months.
Reheating
Reheat in the oven at 350°F for 10–15 minutes to bring back the crispiness. An air fryer at 350°F for about 5 minutes works even better. The microwave works too, but they won’t be crispy.
Frequently Asked Questions
No, you don’t need to peel them. The skin is edible and adds texture and nutrients when roasted. Just scrub them well under cold water first. If the skin looks rough or warped, you can peel it (it’s mostly a preference thing).
Purple sweet potatoes are denser, less sweet, and have an earthy, nutty flavor compared to soft, candy-sweet orange varieties. They also hold their shape better when roasted. Plus, they’re rich in anthocyanins (the antioxidant compounds responsible for their vibrant purple colour).
You can often find them at Whole Foods, Sprouts, Trader Joe’s, farmers’ markets, or Asian grocery stores. The most common U.S. variety is Stokes Purple. They’re easiest to find from fall through spring, but are becoming more widely available year-round.
Yes! The same method works with any sweet potato variety. Orange sweet potatoes cook slightly faster and are softer and sweeter, while purple varieties are denser and nuttier.
Soaking isn’t necessary but can help remove surface starch, which encourages crispiness. If you skip soaking, just pat the potatoes dry after cutting (moisture is the enemy of crispy roasting).
They’re ready when the edges are golden and slightly crisp, and a fork slides easily into the center. At 400–425°F, cubed potatoes usually take 25–35 minutes, depending on size.
Roasted Purple Sweet Potatoes
Ingredients
- 2 lbs purple sweet potatoes skin on, cleaned, cut into 1 inch pieces
- 2 tbsp extra-virgin olive oil
- 1 tsp kosher salt
- ½ tsp ground pepper
- ¼ cup diced green onions
- 3 tbsp minced fresh parsley
- 1 tsp lemon zest
- 1 tbsp lemon juice
- 1 tbsp extra-virgin olive oil
Instructions
- Preheat the oven to 400F. On a large baking sheet lined with parchment paper, toss the cut sweet potatoes with 2 tbsp olive oil, 1 tsp salt and ½ tsp pepper. Spread them out in a single layer. Bake for 20 minutes and then toss, spreading back out into a single layer. Bake for 10-15 more minutes until fork tender and starting to caramelize / brown around the edges.
- When the sweet potatoes come out of the oven, let them rest on the baking sheet for 5 minutes. Then, move the potatoes to the center of the baking sheet and drizzle / sprinkle over the diced green onions, minced fresh parsley, lemon zest, lemon juice and extra-virgin olive oil. Gently toss to combine on the baking sheet. Alternatively, you can toss gently in a bowl. Serve immediately.
Notes
- We love these roasted purple sweet potatoes as an easy side dish for any weeknight!
- These are great to meal prep as a side dish for breakfast or pair with your favourite protein throughout the week.
