1. Preheat the Oven

Set the oven to 400°F (200°C). A properly preheated oven ensures that the potatoes start crisping up as soon as they hit the baking sheet.

2. Prepare the Ingredients

Wash the potatoes thoroughly, especially if keeping the skin on for added texture and nutrients. Slice them into ½-inch-thick rounds to ensure even cooking. Cut the onion in half, then into quarters, allowing it to caramelize beautifully in the oven.

3. Create the Seasoning Mixture

In a large mixing bowl, combine canola oil, olive oil, chopped garlic, and the onion soup mix. Stir well to ensure the flavors are evenly distributed.

4. Coat the Potatoes and Onions

Add the sliced potatoes and onions to the bowl, tossing them until they are fully coated with the seasoned oil mixture. This step is crucial for ensuring an even, crispy texture.

5. Arrange on a Baking Sheet

Spread the potatoes and onions in a single layer on a large baking sheet. Overcrowding can lead to steaming instead of crisping, so use two sheets if necessary.

6. Bake Until Golden and Crispy

Roast in the preheated oven for 30-40 minutes, flipping the potatoes halfway through to promote even browning. The potatoes should be golden and crisp around the edges, while the onions become soft and slightly caramelized.

7. Serve Immediately

Remove the tray from the oven and serve while warm. The contrast between the crispy potatoes and sweet roasted onions makes this dish a perfect complement to any meal.