Roasted Potatoes and Onions

The smell of onions hitting a hot oven is one of those quiet kitchen thrills that makes the whole house feel like home, even if home is just a small apartment with a finicky stove. I started roasting potatoes and onions together out of laziness one Tuesday night and quickly realized the combination was far greater than the effort required. The onions melt into sweet jammy edges while the potatoes go crackling and golden on the outside. It has been a staple on my table ever since.

My friend Maria once watched me make these during a Sunday dinner prep and declared them better than any fancy gratin she had ever attempted. She now texts me photos of her own versions, some with paprika, some with rosemary, all proudly golden and slightly uneven in the best way.

Ingredients

• 2 lbs Yukon Gold or red potatoes: Yukon Golds hold their shape beautifully while getting a creamy interior and crisp exterior, making them the ideal roasting potato.
• 2 large yellow onions: Cutting them into thick wedges keeps them from burning and allows that slow sweet caramelization to develop.
• 3 tbsp olive oil: Do not skimp here because the oil is what creates that shattering crisp crust on every edge.
• 1 1/2 tsp kosher salt: Proper salting is the difference between bland and irresistible roasted vegetables.
• 1/2 tsp freshly ground black pepper: Freshly cracked pepper adds a gentle warmth that pre ground simply cannot match.
• 1 tsp dried thyme or rosemary: Thyme gives an earthy sweetness while rosemary goes piney and bold, so choose based on your mood.
• 2 cloves garlic, minced (optional): Garlic adds a savory depth but can burn if the roast goes long, so toss it halfway through if you prefer.
• 2 tbsp fresh parsley, chopped (optional): A bright finishing sprinkle that wakes up the whole tray right before serving.

Instructions

Preheat and prepare:

Crank your oven to 425 degrees F and line a large baking sheet with parchment paper so nothing sticks and cleanup is effortless.

Toss everything together:

Pile the cubed potatoes and onion wedges into a large bowl, drizzle with olive oil, sprinkle with salt, pepper, dried herbs, and garlic, then use your hands to coat every piece evenly.

Spread in a single layer:

Dump the mixture onto your prepared sheet and spread it out so no pieces are overlapping because crowding is the enemy of crispiness.

Roast and flip:

Slide the tray into the oven and roast for 35 to 40 minutes, flipping everything halfway through so each side gets its turn against the hot metal.

Finish and serve:

Pull the tray out when the potatoes are deeply golden and the onions are soft and caramelized at the edges, scatter with fresh parsley, and serve warm.

Save

One winter evening I brought a double batch of these to a potluck and they disappeared before the main course was even served. There is something deeply satisfying about watching people fight over roasted onions.

Picking the Right Potato

Yukon Golds are my go-to because their naturally buttery texture means they crisp outside while staying creamy within. Red potatoes work beautifully too if you prefer a slightly waxier bite that holds firm even after extended roasting.

The Onion Question

Yellow onions are the classic choice here because they mellow into deep sweetness under high heat without turning mushy or disappearing entirely. I have tried red onions and they are lovely for color but tend to char faster, so keep an eye on them if you go that route.

Serving and Storing

These roast beautifully alongside a weeknight protein but also make a wonderful vegetarian meal piled onto a grain bowl with a dollop of yogurt. They reheat surprisingly well in a hot skillet the next day, though they rarely last that long in my kitchen.

• Leftovers keep in an airtight container in the fridge for up to four days.
• A quick reheat in a skillet over medium heat restores the crisp edges beautifully.
• Always taste and adjust salt right before serving because flavors can settle during storage.

Save

Some recipes are about technique and others are about timing, but this one is simply about letting honest ingredients do their thing in a hot oven. Make it once and it will quietly become part of your regular rotation without fanfare.

Recipe FAQs

→ What type of potatoes work best?

Yukon Gold or red potatoes are ideal because they hold their shape well during roasting. Their naturally creamy texture creates a perfect contrast between the crispy exterior and tender interior. Russet potatoes can also work but may become softer.

→ How do I get the crispiest results?

Soak cut potatoes in cold water for 30 minutes to remove excess starch, then pat them completely dry before tossing with oil. Arrange vegetables in a single layer without overcrowding the pan, and flip halfway through cooking for even browning.

→ Can I prepare this ahead of time?

Cut the vegetables up to a day in advance and store them separately in the refrigerator. Pat potatoes dry before roasting. You can also fully roast the dish ahead and reheat at 400°F for 10-15 minutes to recrisp.

→ What herbs pair well with this combination?

Thyme and rosemary are classic choices that complement the earthy potatoes. Fresh or dried sage, oregano, or Herbes de Provence work beautifully. Add smoked paprika for a subtle smoky depth or garlic powder for extra savory notes.

→ What temperature should I roast at?

Roast at 425°F (220°C) for optimal crisping. This high heat creates the golden, crunchy exterior while cooking the potatoes through. Lower temperatures will still cook them but may result in softer, less crispy texture.

→ Can I add other vegetables?

Carrots, bell peppers, or Brussels sprouts pair nicely with this combination. Add heartier vegetables like carrots at the start, and quicker-cooking vegetables like bell peppers about 15 minutes into roasting time.