1 Preheat oven to 375°F. Mix 3 tablespoons of the sugar and cinnamon in small bowl. Beat egg and water in another small bowl. Set aside.
2 Sprinkle work surface with 1/2 cup of the remaining sugar. Coat puff pastry sheets on both sides with remaining 1/2 cup sugar. Roll out each sheet into a 13x12-inch rectangle. Fold one long side in thirds to the middle of the sheet. Repeat with opposite side. Fold sheet lengthwise in half. Dough should now be a 13x2-inch log with 6 layers. Repeat with remaining puff pastry sheet.
3 Cut logs into 1/2-inch thick slices. Place about 2 inches apart on ungreased baking sheets. Brush each slice with egg wash then sprinkle with cinnamon sugar. Keep uncut puff pastry log in refrigerator until ready to slice.
4 Bake 20 to 24 minutes or golden brown, turning palmiers over halfway through cooking. Remove to wire racks; cool completely.