Heat the Pizzelle waffle iron, while you prepare the batter.
Whisk eggs, white sugar, butter, and anise extract in a large bowl. Sift in the flour, baking powder, and salt until the batter is smooth.
When the iron is ready to use, spray with non-tick cooking spray. Place one tablespoon of batter on each of the hot plates, and close the lid. A cookie scoop or melon baller works perfectly for this.
Cook until hardly any steam is being produced, usually somewhere between 45 seconds to a minute.
Some models have a light that goes from red to green as the Pizzelle cook and back to green a second time, indicating that the Pizzelle are ready.
Use a fork or a thin spatula to remove the Pizzelle to a wire rack to cool. Continue until the batter is all used up.
Cool Pizzelle completely, then sprinkle with powdered sugar.
Store the Pizzelle in your favorite jar, or tins for longer storage. This will help to retain their crispy textures.