Step 1

Prepare the Pan - Line a large baking sheet with foil. Grease with olive oil, spreading into an even layer to prevent sticking.

Step 2

Prepare the Potatoes - Wash and peel the sweet potatoes, trim off the ends, and cut them into ¾" thick rounds.

Step 3

Toss with Seasonings - In a large bowl, evenly coat the sweet potatoes with olive oil. Sprinkle with salt, garlic powder, and black pepper, and stir to combine.

Step 4

Roast - Add the slices to the baking sheet in a single layer, then tightly cover with foil. Set the oven rack to the center position. Place the tray inside and heat to 425ºF (218ºC). Roast for 30 minutes, then carefully remove the top layer of foil and discard.Continue to roast until the pieces turn golden brown, about 15 to 25 minutes. Remove the tray from the oven and carefully flip the potatoes. Finish roasting until the top and bottoms are golden brown, about 10 to 15 minutes.

Step 5

Cool the Potatoes - Cool for 10 minutes on the sheet pan before transferring them to a serving platter. Garnish with chopped thyme and serve warm.