Potato, Leek & Goat Cheese Galette

Preheat oven to 375 degrees F. Slice potatoes crosswise into 1/4-inch-thick rounds using a mandoline. Place potatoes and water in a microwaveable bowl; cover tightly with plastic wrap. Microwave on HIGH until tender, about 6 minutes. Let cool about 10 minutes.

Meanwhile, heat oil in a skillet over medium. Add leeks; cover and cook, stirring occasionally, until very soft, about 10 minutes. Stir in thyme, salt and pepper. Remove from heat; let cool to room temperature, about 10 minutes.

Line a baking sheet with parchment pepper. Remove pie crust from shell; roll crust out on prepared baking sheet into a 12-inch circle (crust may crack as you roll it out). Spread leek mixture evenly over crust, leaving a 2-inch border. Top evenly with potatoes; sprinkle with goat cheese. Fold crust edges up and in over filling, overlapping edges as needed; if desired, crimp edges. Brush crust with egg.

Bake in preheated oven until golden brown, 25 to 30 minutes. Remove from oven; cut into wedges.