Some side dishes take all evening. This one does not. Thinly sliced potatoes, tossed in oil and seasoning, come out of the air fryer golden at the edges, crisp on the outside and soft in the middle — in under twenty minutes, with barely any washing up. They go with almost everything: roast chicken on a Sunday, a fried egg for a quick supper, burgers on a Friday night, or just on their own with a dip while you decide what to cook next.
The trick is not complicated, but it matters. Slice them evenly, soak away the starch, dry them properly and give them space in the basket. Get those four things right and the air fryer does the rest. This guide walks you through the whole thing, step by step, so your sliced potatoes turn out crispy and golden every single time.
Table of Contents
Ingredients
- 4 medium Maris Piper or Yukon Gold potatoes
- 2 tablespoons olive oil
- 1 teaspoon garlic powder
- 1 teaspoon paprika
- 1/2 teaspoon onion powder
- Salt and black pepper, to taste
- 2 tablespoons grated parmesan (optional)
- Fresh parsley, chopped, to serve
Method
- Wash and slice the potatoes. Scrub the potatoes well under cold running water. You can peel them or leave the skins on — the skins go lovely and crisp, so most of the time it is better to leave them. Slice the potatoes thinly and evenly, about 3 to 4mm thick. A mandoline makes this much easier and gives you perfectly even slices, but a sharp knife and a steady hand work just as well. Even slices are the whole game here: if some are thick and some are paper thin, the thin ones will burn before the thick ones are cooked.
- Soak the slices in cold water. Drop the slices into a large bowl of cold water and leave them to soak for 20 to 30 minutes. This washes away the surface starch, which is the secret to slices that turn crisp instead of sticking together and going soft. You will see the water turn cloudy — that is the starch coming off, exactly what you want.
- Drain and pat very dry. Drain the slices in a colander, then spread them out on a clean tea towel or kitchen paper and pat them dry on both sides. Take your time with this step. Wet slices steam in the basket instead of crisping, and no amount of extra cooking time will fix a soggy start.
- Toss with oil and seasonings. Tip the dry slices into a large bowl. Pour over the olive oil and add the garlic powder, paprika, onion powder, salt and black pepper. Toss everything together with your hands until every slice is lightly and evenly coated. The oil is what carries the heat to the surface of the potato and helps the edges go golden, so do not skip it — but you do not need much, two tablespoons is plenty.
- Arrange in a single layer. Preheat the air fryer for a few minutes, then arrange the slices in the basket in a single layer, slightly overlapping at most. If they are piled on top of each other, the ones in the middle will steam and stay pale. Cook in two batches if you need to — it is worth the extra few minutes.
- Air fry at 190°C for 15 to 18 minutes. Cook for 15 to 18 minutes, flipping the slices halfway through with tongs or a spatula, until they are golden and crisp at the edges. If you are using parmesan, sprinkle it over the slices for the last 2 minutes so it melts and turns lightly golden without burning. Serve straight away, scattered with fresh parsley, while the edges are at their crispiest.
Tips for Perfect Air Fryer Sliced Potatoes
Even slicing matters most. The single biggest difference between good sliced potatoes and great ones is how evenly they are cut. A mandoline is the easiest way to get there, and it is worth using the guard that comes with it. If you are slicing by hand, take it slow and aim for the same thickness every time.
Don’t overcrowd the basket. This is the most common mistake with anything in the air fryer. Hot air needs to circulate around every slice, and it cannot do that if they are packed in tight. One even layer will always beat a full basket. Cook in batches if you have to.
Dry the slices well. After soaking, the slices are full of water on the surface. If that water goes into the basket, it turns to steam and works against the crisp edges you are trying to build. Pat them dry properly on both sides before you add the oil.
Soak to remove the starch. It might feel like a step you could skip, but it is what stops the slices from sticking together in a clump and helps them crisp up individually. Twenty minutes in cold water is enough. If you are in a hurry, even ten minutes is better than none.
Serving Suggestions
Sliced potatoes are one of those sides that fit almost any plate. Serve them next to roast chicken or grilled fish, piled beside a burger, or with a fried egg and baked beans for a quick supper. They are brilliant with dips too — garlic mayonnaise, sour cream and chive, or a simple ketchup. For a heartier plate, top them with a fried egg and a handful of grated cheese, or serve them as part of a breakfast spread with sausages and beans. Leftovers are rare, but if you do have any, they crisp up again in three to four minutes in the air fryer at 180°C.
FAQs
Do I have to soak the potato slices first?
It is strongly recommended. Soaking removes the surface starch, which stops the slices from sticking together and helps them turn crisp and golden. If you skip it, they tend to clump and go soft in the middle. Twenty to thirty minutes in cold water is the sweet spot.
Can I use other potatoes?
Maris Piper and Yukon Gold give the best results because they go fluffy inside and crisp up well on the edges. Russet potatoes work too. Waxy varieties such as new potatoes or Charlotte will cook, but they hold their shape and stay firm rather than going fluffy in the middle.
Why aren’t my sliced potatoes crispy?
Usually it is one of three things: the slices were still wet when they went in, the basket was too full, or the slices were cut unevenly. Dry them properly, cook in a single layer, and keep the thickness even. A hot, preheated air fryer helps as well.
Can I make them ahead of time?
Yes. Slice and soak the potatoes a few hours ahead and keep them in cold water in the fridge, then drain, dry and cook just before serving. Cooked leftovers keep in the fridge for two days and crisp up again in three to four minutes at 180°C.
