Mix together in a medium bowl the flours, sugar, and baking powder. Add the melted butter, whisked eggs, vanilla or other extract, and water.
Heat your iron. Spray each side with non-stick or vegetable oil. Add 1 heaping teaspoon of batter and close the lid. Cook as directed by the iron manufacturer recommends. (Mine cooks on our gas stove set to medium for 12-15 seconds per side).
Remove each cookie to a plate or wire rack using a fork. If rolling, roll immediately around a spatula handle. Cool completely on a wire rack..
Dust with powdered sugar. Enjoy immediately. Serve alongside a bowl of gelato, ice cream, or panna cotta.
Or fill with Chocolate Ganache Filling if desired just prior to serving for a stand alone dessert.
Store any remaining in an airtight container for 2-4 days (and up to 1 week) for best freshness. Sealing first in a freezer bag and then sealing in an airtight container will keep these crisp.