2mediumleeks (white parts only)halved lengthwise, rinsed well, and cut into 3-inch pieces
1/2poundcarrotscut into thin 3-inch sticks
10sprigsthyme
1tbsp.unsalted butteroptional, cut into small pieces
Coarse salt and ground pepper
Instructions
Preheat oven to 400 degrees. Place potatoes, leeks, carrots, thyme, and butter (if using) in center of a 24-inch-long piece of parchment. Season with salt and pepper. Fold into a twist or envelope shape.
Place packet on a rimmed baking sheet and bake until packet is puffed up and potatoes are tender, 25 to 30 minutes.