This air fryer Japanese sweet potato recipe is one of my favorite ways to cook Murasaki sweet potatoes. The skins turn lightly crisp while the inside becomes unbelievably creamy—almost custard-like—with a natural sweetness that tastes like dessert without adding sugar. No foil, no boiling, no extra steps. Just simple, cozy perfection straight from the air fryer.
If you enjoy easy, hands-off air fryer recipes like this, you’ll also love this Air Fryer Twice Baked Potatoes recipe. Now for the Japanese sweet potatoes you’ve been waiting for!
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Why You’ll Love This Recipe
- Custardy-soft centers: Murasaki sweet potatoes cook up incredibly creamy inside—almost like baked custard.
- Crisp, flavorful skins: The air fryer crisps the skins beautifully without drying the inside.
- Minimal ingredients: You really don’t need much—these potatoes shine on their own.
- Hands-off cooking: Once they’re in the air fryer, there’s nothing else to do.
- Versatile: Perfect as a snack, side dish, or easy meal prep staple.
Video Instructions
Ingredients & Substitutions
- Japanese Murasaki sweet potatoes: These are naturally sweeter and drier than orange sweet potatoes, with a nutty, chestnut-like flavor. If you looking for something new to try, you can swap these with Korean sweet potatoes (goguma), Hannah sweet potatoes, or orange sweet potatoes (shorter cook time).
- Salt: Brings out the natural sweetness. You can use flaky sea salt or skip entirely if you prefer them plain.
- Black pepper: Adds subtle warmth. If you want a sweeter version, I’ve found that cinnamon works really well for a change in taste.
- Optional toppings: Butter, honey, sesame seeds, miso butter, or even cinnamon sugar—these potatoes handle both sweet and savory beautifully.
Instructions
Step 1 – Prep the Sweet Potatoes
Wash and scrub the Murasaki sweet potatoes well, then pat them completely dry. Rub each potato lightly with oil and sprinkle with salt and pepper.
Step 2 – Air Fry Until Tender
Preheat the air fryer to 375°F (190°C). Place the sweet potatoes in the basket with space between them—don’t overcrowd. Air fry for 35–45 minutes, flipping halfway, until the skins are crisp and a fork slides in easily.
Note: Larger potatoes may need up to 55 minutes.
Step 3 – Serve
Slice open lengthwise and fluff the centers with a fork. Top with butter, honey, sesame seeds, miso butter, or keep them simple and enjoy as-is.
Try Air Fryer Salt & Pepper Crispy Tofu for a quick air fryer meal.
Pro Cooking Tips
- Choose similar-sized potatoes: I always try to match sizes so they cook evenly—mixed sizes can lead to uneven doneness.
- Skip the foil: Foil traps steam. I’ve tested the fryer Japanese sweet potato recipe both ways, and unwrapped potatoes are noticeably sweeter and crispier.
- Be patient: If they’re still firm, they’re not done yet. Murasaki potatoes need time to fully soften inside.
- Miso butter upgrade: One of my favorite toppings is 1 tablespoon butter mixed with 1 teaspoon white miso—simple and very Japanese.
- Fluff the center: Breaking up the inside with a fork makes them extra creamy and helps toppings melt evenly.
You may also like Air Fryer Korean Chicken Wings — crispy wings tossed in a sweet and spicy Korean-style sauce.
FAQs
No. I never peel them. The skins crisp up nicely and are completely edible.
They just need more time. I add 5–10 minutes, depending on size, until a fork slides in easily.
Yes. I halve them lengthwise and air fry cut-side up for 20–25 minutes if I’m short on time.
Absolutely. I’ve used cinnamon sugar, everything bagel seasoning, garlic butter, and even chili oil—they’re incredibly versatile.
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Rate This Recipe
Air Fryer Japanese Sweet Potato (Murasaki)
Ingredients
- 4 Japanese Murasaki sweet potatoes (small–medium size)
- 1 tablespoon vegetable oil (or neutral oil)
- ½ teaspoon salt
- ½ teaspoon black pepper
- butter, honey, sesame seeds or miso butter optional toppings
Instructions
- Choose similar-sized potatoes: I always try to match sizes so they cook evenly—mixed sizes can lead to uneven doneness.
- Skip the foil: Foil traps steam. I’ve tested the fryer Japanese sweet potato recipe both ways, and unwrapped potatoes are noticeably sweeter and crispier.
- Be patient: If they’re still firm, they’re not done yet. Murasaki potatoes need time to fully soften inside.
- Miso butter upgrade: One of my favorite toppings is 1 tablespoon butter mixed with 1 teaspoon white miso—simple and very Japanese.
- Fluff the center: Breaking up the inside with a fork makes them extra creamy and helps toppings melt evenly.
Video
Notes
Taste & Texture
- Lightly crisp skin
- Ultra-creamy, custard-like interior
- Naturally sweet with nutty, chestnut notes
- Comforting, cozy, and deeply satisfying without added sugar
Storage, Freezing & Reheating
Refrigerate:Store cooked potatoes in an airtight container for up to 4 days. Freeze:
Freeze whole or mashed for up to 2 months. Wrap individually for best texture. Reheat:
- Air fryer: 350°F (175°C) for 5–7 minutes
- Microwave: 1–2 minutes
- Oven: 375°F (190°C) for 10 minutes
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