At last, the beloved cookie is now gluten-free friendly! You'll need a pizzelle iron to make these delicate Italian waffle cookies. Prepare the recipe using the Cannoli Shell Variation to make delicious cannoli.
Preheat pizzelle iron.
Weigh or lightly spoon potato starch and flours into a dry measuring cup; level with a knife. Combine potato starch, flours, granulated sugar, and next 3 ingredients (through salt) in a medium bowl, stirring with a whisk.
Combine 1/4 cup warm water and next 5 ingredients (through egg white) in a large bowl; stir with a whisk. Slowly add flour mixture to egg mixture; stir with a whisk until smooth.
Coat pizzelle iron with cooking spray. Spoon 1 tablespoon batter onto hot iron, spreading batter to edges. Cook according to manufacturer’s instructions. Repeat procedure with remaining batter. Top pizzelles with powdered sugar.
Cannoli Shell Variation: Remove hot pizzelle from iron; wrap around a cannoli mold or the handle of a large wooden spoon, overlapping edges of shell. Remove shell from mold; cool on a wire rack.