Preheat pizzelle, iron and lightly brush with vegetable oil
In a large bowl, combine flour, sugar, butter, eggs, anise extract, baking powder and Sambuca. Drop a rounded tablespoon of batter in the center of each onto pizzelle outline on the pizzelle iron and close.
Bake as directed by the manufacturer or until golden brown - 30 seconds to 1 minute. Carefully remove each pizzelle with a spatula to a cooling rack. Once cool, break off the ends of any irregular ones that the batter may have traveled off the pattern. Repeat with remaining batter.
Cool completely and dust with powdered sugar.