Crispy edges, creamy centers, and a quick herb oil that soaks into all the crags—these air fryer smashed sweet potatoes are an easy side dish that feels a little fancy without extra work.
Why This Air Fryer Recipe Works
The air fryer’s circulating heat dries the surface fast, which is exactly what smashed sweet potatoes need to crisp up. Boiling (or steaming) first gets the centers tender so you can smash without fighting a raw potato.
Herb oil goes on after cooking, so the herbs stay bright instead of scorching in the basket. You get crunch, color, and fresh flavor in one step.
- Par-cook first for a creamy interior
- Smash for more surface area = more crisp edges
- Finish with herb oil for fresh flavor without burning
Ingredients You’ll Need
Keep the potatoes simple and let the herb oil do the heavy lifting. This recipe works best with small to medium sweet potatoes so they cook evenly and smash into nice rounds.
- Small to medium sweet potatoes (red/orange varieties are ideal)
- Olive oil (plus more for the herb oil)
- Kosher salt
- Black pepper
- Fresh herbs (parsley, chives, dill, and/or cilantro)
- Garlic (finely grated or minced)
- Lemon zest and/or a squeeze of lemon juice
- Optional: red pepper flakes for heat
How to Make Air Fryer Crispy Smashed Sweet Potatoes with Herb Oil in the Air Fryer
1) Cook the sweet potatoes until tender. Add whole sweet potatoes to a pot, cover with cold water, and salt the water. Simmer until a knife slides in easily (typically 18–25 minutes depending on size), then drain well.
2) Dry and cool briefly. Let the potatoes sit in the colander for a few minutes so steam escapes. Drier potatoes crisp better.
3) Smash. Line a sheet pan or cutting board with parchment for easy cleanup. Use the bottom of a glass or measuring cup to press each potato into a 1/2-inch-thick round. If the skin splits, that’s fine—those edges get extra crisp.
4) Oil and season. Brush or drizzle both sides with olive oil and season with salt and pepper.
5) Air fry until crisp. Preheat the air fryer. Arrange smashed sweet potatoes in a single layer (work in batches if needed). Air fry, flipping once, until deep golden and crisp at the edges.
6) Make the herb oil. While they cook, stir together olive oil, chopped herbs, garlic, lemon zest (and/or juice), a pinch of salt, and optional red pepper flakes.
7) Finish and serve. Spoon herb oil over the hot smashed sweet potatoes right before serving so the tops glisten and the herbs stay fresh.
Air Fryer Time and Temperature
Air fryers vary, so use these as a starting point and adjust for your model and potato thickness.
- Preheat: 400°F for 3 minutes
- Cook: 400°F for 12–16 minutes total
- Flip: after 6–8 minutes
They’re done when the edges are crisp and browned and the centers feel soft when pressed. If they’re tender but not crisp, add 2–3 more minutes and avoid overcrowding.
Tips for the Best Results
Dryness and spacing are the big wins here. You’re aiming for a thin sheen of oil and plenty of airflow around each potato.
- Drain thoroughly after boiling, then let them steam-dry 5 minutes
- Smash to an even 1/2-inch thickness so they crisp uniformly
- Don’t crowd the basket—cook in batches for the crunchiest edges
- Flip carefully with a thin spatula to keep the rounds intact
- Add herb oil after air frying so herbs and garlic don’t burn
Variations and Substitutions
This base method is flexible. Swap the herb oil depending on what you’re serving or what’s in your fridge.
- Italian-style: parsley + basil with lemon zest and grated garlic
- Southwest: cilantro + lime juice + pinch of cumin
- Garlic-chive: chives + extra garlic, finish with flaky salt
- Spicy: add chili crisp to the herb oil (use less salt if it’s salty)
- No fresh herbs: use a smaller amount of dried herbs in the oil, then rest 5 minutes to bloom
If you want extra richness, drizzle with a little melted butter after air frying, then spoon the herb oil on top.
What to Serve With It
These are a strong side for weeknight proteins and also work on a brunch spread. The herb oil pairs especially well with simple mains.
- Air fryer chicken thighs or drumsticks
- Salmon (air fryer or oven) with lemon
- Burgers or turkey burgers
- Eggs and a simple salad for brunch
For more air fryer side ideas, see Air Fryer Recipes.
Storage and Reheating
Store leftover smashed sweet potatoes and herb oil separately if possible. Refrigerate potatoes in an airtight container for up to 4 days; herb oil keeps 3–4 days (stir before using).
To reheat, air fry at 375°F for 4–7 minutes until hot and re-crisped. Add fresh herb oil after reheating for the best flavor and color.
More air fryer reheating guides here: Air Fryer Reheating Guide.
FAQ
Why aren’t my smashed sweet potatoes getting crispy in the air fryer?
Most often it’s moisture or crowding. Drain and steam-dry the potatoes well, then air fry in a single layer with space around each piece. A quick preheat and a light coating of oil also help browning.
Do I need to peel sweet potatoes before boiling?
No—leave the skins on. They help the rounds hold together after smashing and add texture. Just scrub them well before cooking.
Can I cook the sweet potatoes ahead of time?
Yes. Boil and chill them up to 2 days ahead, then smash and air fry when you’re ready. Cold, cooked sweet potatoes often smash neatly and crisp well once oiled.
Can I make these without fresh herbs?
You can. Use a smaller amount of dried herbs (they’re stronger) and let the oil sit a few minutes so the flavor infuses. If you have it, lemon zest still adds a fresh finish.
How do I keep the herb oil from tasting too sharp?
Finely grate the garlic (or use less) and mix it into the oil with a pinch of salt and lemon. Let it sit 5–10 minutes to mellow before spooning over the hot potatoes.
