3/4 pound small new potatoes, halved or quartered if large
2 medium leeks (white parts only), halved lengthwise, cut into 3-inch pieces
1/2 pound small carrots, halved crosswise if long
10 sprigs of thyme
1 Tbsp unsalted butter
coarse salt and ground pepper

1. Preheat oven to 400 degrees.  Place potatoes, leeks, carrots, thyme and butter in center of 24 inch piece of parchment.  Season with salt and pepper and fold into an envelope.

2. Place packet on rimmed baking sheet and bake until packet is puffed up and potatoes are tender, about 25 to 30 minutes.