Thaw the pastry sheets at room temperature for 40 minutes or until they're easy to handle.
Unfold 1 pastry sheet onto a lightly floured surface. Roll the pastry sheet into a 15x10-inch rectangle. Cut the pastry rectangle lengthwise into 3 (5x10-inch) rectangles. Brush the pastry rectangles with the egg. Repeat with the remaining pastry sheet.
Spread 1 tablespoon cream cheese on the bottom half of each pastry rectangle. Top each with about 3 slices ham,about 2 tablespoons arugula leaves and 2 slices nectarine. Fold the top halves over the filling and press the edges to seal.
Place each pastry packet one at a time into a panini maker and close the top. Cook for 6 minutes or until the panini is golden. Remove the panini to a baking sheet and keep warm in a 275 degrees F. oven while the remaining paninis are cooked.
Double Berry Paninis: Prepare the pastry rectangles as directed above in Steps 1 and 2. In Step 3, spread 1 tablespoon cream cheese on the bottom half of each pastry rectangle. Top each with 2 teaspoons strawberry jam, about 5 raspberries or blueberries and 1 tablespoon toasted almonds. Fold and cook as directed above. Sprinkle with confectioners' sugar.
Per Serving: 525 calories;34.8 g fat;
34.1 g carbohydrates;
19.7 g protein;
82 mg cholesterol;
981 mg sodium.