Step #1 Lightly oil a nonstick baking sheet, or cover a regular baking sheet with silicone-finished parchment or a silicone liner.
Step #2 Mound thinly shredded parmesan cheese on the pan, using 2 tbsps per cracker.
Step #3 Place the portions at least 6 inches apart, then spread each mound into a 5- to 6-inch round with your fingertips.
Step #4 Bake in a 375° oven until cheese is pale golden brown & melded together, 3 to 4 mins.
Step #5 Watch carefully - cheese tastes scorched if overbaked.
Step #6 While crackers are hot & flexible, lift from pan 1 at a time with a wide spatula & drape over a rolling pin (or a room-temperature wine bottle) until cool & rigid.
Step #7 Then use or package airtight at once.
Step #8 (If making crackers ahead, put in the fridge up to 6 days.
Step #9 )Note: To get a lacy look, the cheese must be freshly shredded (the longer the shreds, the better) so it sticks together.