Crispy Mustard Roasted Potatoes

These crispy mustard roasted potatoes feature an ultra-crunchy, craggy exterior seasoned with tangy Dijon and whole grain mustard, achieved through a simple food-science parboiling technique.

Why This Recipe Works:

• Parboiling in alkaline water breaks down the potato surfaces, creating a starchy paste that roasts into an incredibly crispy crust.
• Whisking the mustard with high-heat olive oil emulsifies the mixture, preventing the mustard from burning or separating on the pan.
• Roasting at a high temperature on a preheated heavy-duty baking sheet ensures immediate heat transfer and maximum crunch.

I still remember the damp November afternoon in my LIVEy college apartment when I tried to roast potatoes on a warped aluminum sheet pan. I had slathered them in grainy mustard, hoping for a sharp, caramelized crust.

It was a disaster.

The science behind that early failure is actually pretty simple, though I certainly didn't know it back then while scrubbing scorched mustard off my cheap pan until my forearms ache. Mustard contains a high amount of water and vinegar, which creates steam in a hot oven, preventing the potato starch from gelatinizing and crisping up properly. If you just toss raw spuds with mustard and throw them in the oven, you are essentially boiling them in acid.

The simple fix is a two-step method where we parboil the potatoes first in alkaline water to build a starchy slurry on their exterior. This slurry absorbs the oil-soluble flavor compounds of the mustard while creating a craggy, ultra-crispy surface that shatters when you bite into it.

Trust me on this one.

When choosing your potatoes, hands down, Yukon Golds are the absolute perfect choice here. Their natural starch profile holds up beautifully to the parboiling process.

Before you toss them in the oven, tap your metal tongs against your hip and make sure your baking sheet is screaming hot. I love pairing these tangy, crispy spuds with a rich main dish like my favorite Cowboy Butter Steak or some juicy Honey Garlic Pork Chops.

It is pure heaven.

Crispy Mustard Roasted Potatoes

• Publisher Storied Skillet
• Cuisine American
• Category Side Dish, Roasted Potatoes
• Prep Time 15 mins
• Cook Time 40 mins
• Servings 4
• Calories 210 calories
• Rating 4.8 4169
• Tags crispy potatoes, mustard roasted potatoes, roasted potatoes, side dish

Ingredients

• 1 kg (2.2 lbs) Yukon Gold potatoes, peeled and cut into 1.5-inch chunks
• 1/2 tsp baking soda
• 1 tbsp Diamond Crystal kosher salt (about 6 grams), plus more to taste
• 3 tbsp extra virgin olive oil
• 2 tbsp Dijon mustard
• 1 tbsp whole grain mustard
• 2 cloves garlic, finely grated
• 1/2 tsp freshly cracked black pepper
• Fresh parsley, chopped (for garnish)

Directions

1. Preheat your oven to 425°F (218°C) and place a heavy-duty rimmed baking sheet on the middle rack to heat up.
2. Bring a large pot of water to a boil, then add the kosher salt, baking soda, and potato chunks.
3. Boil for about 8 to 10 minutes, or until a knife slides easily into the exterior of a potato but the center remains firm.
4. Drain the potatoes thoroughly in a colander, letting them sit for 2 minutes to allow excess moisture to evaporate.
5. Vigorously shake the colander to rough up the edges of the potatoes, creating a thick layer of starchy paste.
6. In a large bowl, whisk together the olive oil, Dijon mustard, whole grain mustard, grated garlic, and black pepper until fully emulsified.
7. Add the potatoes to the bowl and toss thoroughly until they are completely coated in the mustard mixture.
8. Carefully remove the hot baking sheet from the oven, grease lightly, and spread the potatoes in a single layer, ensuring they do not crowd.
9. Roast for 35 to 40 minutes, flipping them halfway through, until they are deeply golden brown and shatteringly crispy.

Notes

• Always use Diamond Crystal kosher salt. If you only have Morton's coarse kosher salt, use only 1.5 teaspoons (about 4.5 grams) to avoid over-salting.
• Baking soda increases the pH of the boiling water, which breaks down the potato's pectin layer and draws out starch to form that crucial crispy exterior slurry.
• Do not add the garlic to the boiling water or too early in the roasting process; grating it directly into the mustard-oil emulsion protects it from burning and turning bitter.
• After a day in the fridge, the potatoes will lose their initial shatter-crisp texture as the starch retrogrades, but they can be easily revived in a dry skillet or air fryer.
• This recipe was tested on heavy-duty Nordic Ware aluminum sheets; thin pans will warp and cause uneven heat distribution.

Serving Suggestions

These crispy, tangy potatoes are incredibly versatile and bring a punchy contrast to rich, savory meats. Serve them hot straight from the oven with these perfect pairings:

• Serve alongside a perfectly seared Cowboy Butter Steak for an upscale steakhouse dinner at home.
• Pair them with crispy Healthy Crispy Baked Chicken Parmesan to balance the rich marinara and melted cheese.
• Plate them next to juicy Honey Garlic Pork Chops for a quick and satisfying weeknight meal.
• Garnish with a shower of freshly grated Parmesan cheese and finely chopped chives right before serving.
• Offer a side of cool, creamy garlic aioli or sour cream for dipping to contrast the sharp mustard heat.

Storage and Reheating

If you happen to have leftovers, store them in an airtight glass container in the refrigerator for up to four days. Bear with me here: do not expect them to stay crispy in the fridge.

They will get soft.

This is completely normal because the starches absorb moisture from the air over time. To bring them back to life, avoid the microwave at all costs unless you want sad, mushy spuds.

Instead, toss them into a dry, non-stick skillet over medium-high heat for about five minutes. Alternatively, pop them into an air fryer at 380°F (193°C) for three to four minutes until they sizzle and regain their signature crunch.

Ingredient Substitutes

If you don't have everything on hand, here are a few easy swaps that won't ruin your dinner:

1. Yukon Gold Potatoes: You can substitute with Russet potatoes, though they will be slightly fluffier inside and a bit more fragile during the parboiling step.
2. Dijon Mustard: Spicy brown mustard or stone-ground mustard can be used in a pinch, though they will yield a slightly more rustic, earthy flavor.
3. Olive Oil: Any high-smoke-point oil like avocado oil or canola oil will work beautifully for roasting.
4. Baking Soda: If you don't have baking soda, you can still make this recipe, but the potatoes won't get quite as craggy and crispy.

There is something deeply satisfying about watching a humble potato transform into a golden, crispy masterpiece. I hope these become a staple on your dinner table, bringing a little extra warmth and crunch to your cozy weeknights.