In a mixing bowl lightly mix the turkey, cranberry sauce, spinach, and blue cheese.
On a lightly floured surface, unfold puff pastry. Roll each sheet into a 12-in. x 10-in. rectangle; cut each into 2 pieces. Transfer to a greased baking sheet.
Spoon turkey mixture onto each pastry. Top with an 1/8 cup cheddar cheese if desired.
Lightly brush pastry edges with water. Bring long sides over filling, pinching seams and ends to seal. Turn pastries seam side down. Cut small slits into pastry. Brush tops with egg.
Bake at 400° for 20-25 minutes or until golden brown.
* To Freeze: Once fully assembled cover and freeze for 3 to 4 hours. Once frozen store in a ziplock freezer bag for up to six months. When ready to bake remove from the freezer and allow to thaw for 30 minutes. Bake as directed.