Crispy Roast Potatoes: The Method That Works Every Time

Crispy roast potatoes come down to four things: a starchy potato, a short parboil in lightly alkaline water, a good shake in the drained pot, and plenty of hot fat in a hot oven. Skip any one and you get pale, leathery, or soggy potatoes. Get all four and you get a thick, crunchy shell around a fluffy middle.

This guide walks through the method step by step. It explains why each step matters, which potato to buy, how to fix problems, and how to reheat leftovers without losing the crunch.

TL;DR

• Parboil cut potatoes in salted water with a little baking soda until the edges are soft and fraying, then drain and shake them hard.
• Roast on a preheated pan in plenty of hot fat, in a single layer with space between pieces.
• Choose a starchy or all-purpose potato such as Russet or Yukon Gold, and cut pieces with plenty of flat surface.
• Add garlic and delicate herbs in the last 10 minutes so they flavor the potatoes without burning.
• Never refrigerate raw potatoes, and cool leftovers promptly.

Table of Contents

• Why potatoes go crisp (or don’t)
• Choose the right potato
• The method, step by step
• Timeline for a busy evening
• What is the secret ingredient?
• Our perspective: what actually separates crisp from soggy
• Troubleshooting
• Other ways to get a crunchy potato
• Serving and storing leftovers
• Find more tested potato and vegetable recipes
• FAQ
• Sources

Why potatoes go crisp (or don’t)

A crisp potato crust needs two things: a dry, roughed-up surface and fat hot enough to fry it. Moisture is the enemy. Any water left on the outside has to steam off before browning can start, and that is where soggy potatoes begin.

Parboiling solves both problems. It cooks the inside so the roasting stage only has to build the crust. It also softens the outer layer so it can be roughed up. Adding baking soda makes the water alkaline, and that speeds up the breakdown of the surface. One guide to potato starch recommends roughly half a teaspoon of baking soda in the parboiling water for this reason. That surface turns into a thin starchy paste. In a hot oven, the paste becomes a craggy, glassy crust.

This is the same trick behind most of the top-ranked recipes for this dish, including those that call for a longer, slower roast. Some British-style recipes, such as the BBC Food version, promise a fluffy inside and a crunchy outside from a parboil followed by a roast. The details vary, but the logic is shared.

Choose the right potato

The potato you pick sets the ceiling for the result.

If you can only remember one rule, remember this: starchy and all-purpose potatoes make the best roasties. Waxy potatoes hold their structure, which is great for salad and less great for a fluffy middle.

Do not refrigerate raw potatoes before cooking. Cold storage converts starch to sugar, which changes the flavor and can increase acrylamide when potatoes are cooked at high heat. Keep them in a cool, dark pantry instead.

The method, step by step

This serves four as a side dish. Plan on about 2 pounds of potatoes.

What you need

• 2 pounds Russet or Yukon Gold potatoes
• 1 tablespoon kosher salt for the water, plus more for finishing
• About 1/2 teaspoon baking soda
• 1/3 cup high-heat fat: duck fat, beef tallow, or a neutral oil such as avocado or refined olive oil
• 3 to 4 garlic cloves, smashed, and a few sprigs of rosemary or thyme, held back until late

1. Heat the pan and the oven

Set a rack in the upper-middle of the oven. Heat the oven to 425°F, or 450°F if your oven runs cool and your potatoes are not browning. Put a rimmed sheet pan in with the fat in it while the oven heats. A hot pan means the potatoes start sizzling the second they touch it.

2. Cut for surface area

Peel the potatoes if you like, though skin-on works if the skins are thin. Cut into pieces about 2 inches across. Aim for a few flat sides. Flat sides make more contact with the pan, and rough corners make more crunch.

Pieces of similar size cook at the same rate. Do not worry about perfect cubes.

3. Parboil in alkaline water

Put the potatoes in a large pot, cover with cold water by an inch, and add the salt and baking soda. Bring to a boil, then simmer until the outsides are soft and the edges look slightly frayed. That usually takes 7 to 10 minutes after the water comes back to a simmer, depending on piece size. Nadiya Hussain’s advice is also to parboil for seven to 10 minutes, until the outside is cooked, before draining.

A fork should slide into the edge easily but meet resistance in the center. If the centers are completely soft, the pieces will fall apart when you shake them. Stop earlier next time.

The baking soda will foam at first. Add it to the water before it boils, and use a pot with room to spare.

4. Drain, steam dry, and shake

Drain well in a colander. Let the potatoes sit for 3 to 5 minutes so steam escapes and the surface dries. Then return them to the empty pot, put on the lid, and shake firmly for several seconds. You want the edges to look scuffed and slightly mashed. Those scuffed bits are what turn into crunch.

5. Roast in hot fat

Carefully pull the hot pan out, and add the potatoes one at a time so the fat sizzles. Turn each piece once to coat it. Spread them in a single layer with space between pieces. If they touch, they steam. Use two pans if needed.

Roast for about 20 minutes, then flip with a thin metal spatula. Roast another 20 to 30 minutes, turning once more if one side is browning faster than the other. They are done when the crust is deep golden brown and sounds hollow when tapped with a spoon.

6. Add the aromatics late

This is where many recipes go wrong. Garlic and fresh herbs burn in a long roast. The research we reviewed, including the BBC Food recipe, points to adding them in the final 10 minutes of cooking, or making an infused oil separately and applying it at the end. We use both approaches: smashed garlic and rosemary go in for the last 10 minutes, and we pull them out before serving if they have darkened.

Finish with flaky salt right out of the oven, while the surface is still slightly slick.

Timeline for a busy evening

The full process takes about 1 hour 15 minutes, but most of it is hands-off.

1. 0:00 Heat the oven and the pan. Peel and cut.
2. 0:15 Potatoes in the pot, simmering.
3. 0:25 Drain and let them steam dry.
4. 0:30 Shake, then into the hot fat.
5. 0:50 First flip.
6. 1:05 Add garlic and herbs.
7. 1:15 Out, salted, and on the table.

You can parboil and shake up to a few hours ahead. Spread the potatoes on a rack to dry, and keep them out of the fridge for the reasons above if the wait is short. If the gap is longer, cool them quickly and handle them under the food safety guidance below.

What is the secret ingredient?

There are three common answers, and each does something specific.

• Baking soda. It breaks down the surface so it can brown and crisp. This is our default.
• Baking powder or flour. Some cooks toss drained potatoes with a little baking powder for extra crunch, a tip that also appears in advice from Nadiya Hussain. Flour absorbs surface moisture and fries into a thin shell. Both can work, but use a very light hand, because too much tastes chalky or turns pasty.
• Hot fat. The best secret of all. Rendered fat such as duck fat or beef tallow browns beautifully, but a neutral oil works well too. What matters is quantity and temperature, not the specific fat.

You do not need all three. Pick baking soda plus plenty of hot fat and the rest is optional.

Our perspective: what actually separates crisp from soggy

We develop and test every recipe at Forkward Kitchen from scratch, and potatoes are a good example of why we do it that way. A recipe that looks the same on paper can behave very differently depending on the potato, the pan, and the oven. So we care less about a magic trick and more about the failure points.

The failure we see most often is crowding. People parboil perfectly, shake with enthusiasm, then pile everything on one small pan. The potatoes steam in their own moisture and never crisp. Use two pans, and accept the extra dish to wash.

The second is timidity with heat and fat. A potato crust is basically shallow-fried. A scant spoonful of oil on a cool pan will not do it.

Third is impatience at the drain step. Letting the potatoes steam dry for a few minutes costs you nothing and makes a visible difference to the crust.

We also believe in honest labeling. Roast potatoes are an easy dish in terms of skill, but they are a long one, and they punish skipped steps. If we rated this on difficulty alone, it would sit firmly in beginner territory. If we rated it on forgiveness, it would be a notch higher. Knowing that lets you plan your evening, which is the point of a difficulty rating.

— Oloru

Troubleshooting

My potatoes are crisp for five minutes, then go soft

That is trapped steam. Serve them straight from the pan on a rack rather than in a covered dish, and do not stack them. They crisp up again in a hot oven if needed.

The outsides are pale after 45 minutes

Check three things: the oven temperature (use an oven thermometer if you have one), whether the pan was preheated, and whether the potatoes were dry before they hit the fat. Raising the temperature to 450°F for the last 10 minutes usually fixes it.

They fell apart in the pot

You parboiled too long, or the water boiled too hard. Next time, simmer gently and pull them when the centers still resist a fork. Yukon Golds hold together better than Russets.

The garlic tastes bitter

It went in too early. Add it for the last 10 minutes only.

Not enough crunch

Try a rougher shake, a bit more baking soda within the range above, or a hotter pan. Make sure the pieces have some flat sides.

Other ways to get a crunchy potato

A full roast is not always what you want. Depending on the evening, there are good alternatives.

• Smashed potatoes. Boil small potatoes, flatten them, and roast them hard. You get more crust per bite and a faster cook. Our extra crispy smashed potatoes with garlic and rosemary are built on that idea.
• Double-fried potatoes. For restaurant-style crunch, our extra crispy patatas bravas with garlic aioli use a double fry. The same principle drives our poutine with double-fried fries.
• Air fryer. If you cook small batches, an air fryer can crisp parboiled potatoes quickly, and these air fryer crispy techniques cover how to get an even result. Keep the basket loose, as crowding hurts there too.
• One-pan dinners. When you want the potatoes and the main course on one tray, try our one pan chicken thighs and potatoes with lemon and olives. The chicken fat does the work of the roasting fat.

Serving and storing leftovers

Roast potatoes are best fresh, but leftovers can still be good. Food safety comes first. The NDSU Extension guide to potatoes advises keeping hot foods hot, at 140°F or higher, during serving, and says cooked potatoes should spend no more than two hours at room temperature. It also recommends putting leftovers into shallow containers for cooling.

To bring them back, reheat on a hot, dry sheet pan in a 425°F oven for 10 to 15 minutes, turning once. A microwave will make them soft, so avoid it if crunch matters.

What to serve with them

Roast potatoes suit almost any main. They sit well beside a braise, such as our slow cooker pot roast with red wine and garlic, where the gravy gives them something to soak into. For a softer contrast, brown butter mashed potatoes make a good partner on a holiday table. If you want a sweeter option with a bit of heat, our chili-maple roasted sweet potato with sage and yogurt is worth a tray of its own.

Find more tested potato and vegetable recipes

Every recipe on Forkward Kitchen is original, developed and tested in-house, and rated honestly for difficulty, so you know what you are signing up for before you turn on the oven. If you are building a menu, start with our easy side dishes, roasted vegetables and potatoes, or browse all of our recipes. If you want a longer project afterward, our advanced recipes are there when you are ready.

FAQ

What is the secret to crispy roast potatoes?

Parboil the potatoes in salted water with a little baking soda, drain them well, and shake them in the pot to rough up the edges. Then roast them in plenty of hot fat on a preheated pan. The rough, starchy surface is what turns into crunch.

Will flour make my roast potatoes crispy?

A light dusting can help, because flour absorbs surface moisture and fries into a thin crust. Use it sparingly, since too much turns pasty. Baking soda in the parboil does more for most cooks, and the two can be combined if you like.

What temperature should I roast potatoes at?

We start at 425°F and go to 450°F if the oven runs cool or the potatoes are browning slowly. Roasting at 400°F also works if they are browning too fast, but expect a longer cook. A preheated pan matters as much as the oven setting.

Do I have to parboil them?

No, but parboiling is what gives you both the fluffy center and the thick crust. Without it you can still get crisp potatoes by cutting them small and roasting them hot, but the interior will be denser. Smashed potatoes are a good no-fuss alternative.

Can I make them ahead?

You can parboil and shake them a few hours ahead, then roast when you are ready. Do not refrigerate raw or parboiled potatoes for long, because cold changes their starch. Roast just before serving for the best crunch.

Sources

• How to Properly Cook Potatoes, Nowjournal
• Perfect roast potatoes recipe, BBC Food
• How Long Do Potatoes Last?, Reencle
• Let’s Enjoy Potatoes, NDSU Agriculture
• Mary Berry’s twice cooked roast potatoes, The Independent

Recommended

• Extra Crispy Patatas Bravas Recipe with Garlic Aioli
• Extra Crispy Smashed Potatoes with Garlic and Rosemary
• The Ultimate Brown Butter Mashed Potatoes Recipe
• Authentic Poutine Recipe with Double-Fried Fries