Preheat oven to 400°F. Lightly spray a jelly roll pan with cooking spray. Place thawed sheets of puff pastry on a lightly floured surface side by side, allowing short sides to overlap just a bit, and press overlap with fingertips to adhere them. Using a rolling pin, roll combined sheets to a 18- x 13-inch rectangle. Carefully transfer dough to prepared jelly roll pan, and fit into pan, lightly pressing dough up sides of pan. Use a fork to prick holes in dough all over bottom of pan, but not on sides.
Whisk together egg and 1 tablespoon of the heavy cream in a small bowl. Lightly brush egg mixture over dough, and sprinkle evenly with 1 tablespoon of the granulated sugar. Bake in preheated oven until lightly golden brown, 10 to 12 minutes. Remove from oven, and allow to cool slightly.
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