This is my take on the simple potato side dish my dad swore by when I was growing up in the Midwest. On busy weeknights, he’d toss potatoes with just a few pantry staples, slide the pan into the oven, and somehow we’d end up with these tangy, golden, mustardy potatoes that tasted like way more effort than they were. This version sticks to four ingredients—yellow potatoes, whole grain mustard, olive oil, and salt—so it’s practical for hectic schedules but still feels special enough for Sunday dinner. The coarse mustard seeds roast right onto the potatoes, giving you crispy edges, a gentle bite, and that wonderfully tangy flavor he loved.
Serve these whole grain mustard potatoes straight from the baking dish while they’re hot and crisp around the edges. They’re perfect alongside roast chicken, grilled sausages, or a simple pan-seared pork chop. For something lighter, pair them with a big green salad and roasted vegetables, or tuck them into a grain bowl with cooked lentils and steamed greens. They also make great leftovers: reheat in a skillet with a splash of olive oil and top with a fried egg for an easy brunch.
Oven-Baked Whole Grain Mustard PotatoesServings: 4
Ingredients
2 pounds small yellow potatoes, scrubbed and cut into 1-inch chunks
3 tablespoons whole grain mustard
3 tablespoons olive oil
1 teaspoon kosher salt (plus more to taste)
Directions
Preheat your oven to 425°F (220°C). Place a ceramic baking dish (about 9x13 inches or similar) on the middle rack while the oven heats so it gets hot too. This helps the potatoes brown and crisp.
In a large mixing bowl, combine the whole grain mustard, olive oil, and kosher salt. Stir until the mixture looks thick and glossy, with the mustard seeds evenly distributed.
Add the potato chunks to the bowl and toss well, using a spatula or your hands, until every piece is thoroughly coated in the mustard mixture. Take a minute to really work the coating into all the nooks and crannies—this is what gives you that bold, tangy flavor my dad loved.
Carefully remove the hot ceramic baking dish from the oven. Spread the coated potatoes into the dish in an even layer, making sure they’re not piled too high so the edges can brown and crisp.
Roast the potatoes for 25 minutes, then pull the dish out and give everything a good stir, scraping up any mustardy bits that are sticking to the bottom and turning the potatoes so new sides are exposed to the heat.
Return the dish to the oven and continue roasting for another 15 to 20 minutes, or until the potatoes are tender when pierced with a fork and the edges are deeply browned and crisp. Total time will be about 40 to 45 minutes, depending on your oven and the size of the potato pieces.
Taste a potato and add a pinch more salt if needed. Serve the potatoes hot, right in the ceramic baking dish, with all the rustic mustard seeds clinging to the crispy, golden edges.
Variations & Tips
If you have a few extra minutes, you can customize these while still keeping them weeknight-friendly. Swap part of the yellow potatoes for baby red potatoes for a little color and slightly different texture. For a sharper bite, use a very pungent whole grain mustard; for something milder, choose a Dijon-style whole grain mustard. If you want a hint of sweetness, whisk 1 teaspoon of honey into the mustard mixture (this technically adds a fifth ingredient, but it’s a nice twist for kids or anyone who likes sweet-tangy flavors). To make them extra crisp, spread the potatoes out on a preheated sheet pan instead of a deep dish, making sure they’re in a single layer with space between pieces. Leftovers reheat well in a hot skillet with a splash of olive oil, or you can cube them smaller and crisp them up as a breakfast hash. For meal prep, you can cut and coat the potatoes up to 8 hours ahead: store them in the fridge in the baking dish, then roast straight from the fridge, adding 5 to 10 minutes to the cook time.
