Crispy Oven Roasted Potatoes and Onions Step-by-step instructions

Before you start

Before you begin cooking, ensure your oven rack is positioned in the center to allow even heat distribution. Wash your baby potatoes thoroughly under cold running water to remove any dirt, then pat them completely dry with a clean kitchen towel.

Peel your yellow onions and cut them into uniform, thick wedges. Gather your olive oil and dried Italian seasoning so everything is within arm's reach when you start assembling.

Instructions

Prep and Toss

1. 1Preheat the Oven and Sheet Pan
   Place a large rimmed baking sheet on the middle rack of your oven and preheat the oven to 425°F (218°C). Preheating the metal tray is a crucial step that ensures the potatoes sizzle and start crisping the moment they touch the hot surface.
   Look for The oven should reach 425°F (218°C) with the pan inside.
   Tip Do not skip preheating the pan; it guarantees a crispy crust.
2. 2Prep and Toss the Vegetables
   Wash and thoroughly dry the baby potatoes, then cut them in half. Peel the yellow onions and cut them into thick wedges. In a large bowl, combine the halved potatoes and onion wedges, then drizzle with the olive oil and sprinkle with the dried Italian seasoning. Toss until everything is evenly coated.
   Look for Every potato and onion piece should be glossy and coated with herbs.
   Tip Make sure the potatoes are completely dry before tossing to prevent steaming.

At the end of this phase, your oven and baking sheet should be thoroughly heated to 425 degrees Fahrenheit. Your baby potatoes should be cut in half, your onions cut into thick wedges, and both should be evenly coated in the herb-infused olive oil.

There should be no dry spots on the vegetables, and the herbs should be distributed uniformly throughout the bowl.

Initial Sizzle and Roast

3. 3Arrange on the Hot Baking Sheet
   Carefully remove the hot baking sheet from the preheated oven using oven mitts. Immediately transfer the seasoned potato and onion mixture onto the tray. Use a spatula or tongs to arrange the potatoes cut-side down in a single layer. This maximizes direct contact with the hot metal, producing an incredibly crispy crust.
   Look for The vegetables should sizzle aggressively as they touch the hot pan.
   Tip Work quickly but carefully to retain the heat of the baking sheet.
4. 4Roast the First Side
   Return the baking sheet to the oven and roast for 20 minutes without disturbing. Resist the urge to stir or flip them early. Leaving them undisturbed allows the potatoes to develop a deep, golden-brown exterior and helps the onions caramelize beautifully without burning or breaking apart.
   Look for The potatoes should be deeply golden and sizzling at the 20-minute mark.
   Tip Avoid opening the oven door frequently to keep the heat high.

As you transfer the potatoes to the hot baking sheet, you should hear an immediate, aggressive sizzling sound. By the end of this roasting phase, the potatoes should have developed a beautiful, deep golden-brown crust on their flat, cut sides. The onions will start to soften and brown slightly at the edges, and a rich, savory aroma will fill your kitchen.

Flip and Final Crisp

5. 5Flip and Finish Roasting
   Carefully flip the potato halves and onion wedges using a wide spatula. Roast for an additional 10 to 15 minutes, until the potatoes are tender when pierced with a fork and boast an ultra-caps-crisp exterior, and the onions are sweet and caramelized. Serve immediately while hot and crispy.
   Look for The potatoes should make an audible crunch when pressed with a fork.
   Tip Serve immediately, as roasted potatoes will soften as they cool.

After flipping and completing the final roast, the potatoes should be easily pierced with a fork, revealing a fluffy interior. The exterior should be ultra-crisp and golden, making a distinct scraping sound when moved with a spatula. The onion wedges should be tender, sweet, and beautifully caramelized with dark, sweet edges.

Common mistakes

The biggest mistake cooks make with roasted potatoes is overcrowding the baking sheet. If the potatoes and onions are piled on top of each other, they will trap moisture and steam rather than roast, resulting in a mushy texture.

Always use a large enough sheet pan to spread them out in a single layer with space around each piece. Another common error is flipping the potatoes too early; let them sit undisturbed for the first twenty minutes to build up that gorgeous, crispy crust.

How to tell it’s done

The potatoes are perfectly done when they boast a deep golden-brown color and a visibly crispy, shatteringly thin crust. When you press a fork into a potato, it should slide in effortlessly with no resistance, confirming the inside is completely tender and fluffy.

The onions should be soft, translucent in the center, and deeply caramelized and browned on the edges without being charred or burnt.