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Preheat the oven to 400°F (200°C) and line a baking sheet.
Slice potatoes thinly on a mandolin, then soak in water and drain.
Mix flour, Parmigiano, salt, olive oil, and water to make a batter. Add rosemary.
Coat potato slices in the batter, then spread on a baking sheet.
Bake for 40 min., moving the sheet to the upper rack halfway through.
Broil for 2-3 min. for extra crispiness.
Let it cool slightly, then cut into squares.