Line baking sheets with parchment paper; set aside

Chop almonds in food processor or Thermomix into small pieces with some powdery granules; set aside

(If grinding in the Thermomix, scale in almonds; chop for 1 full second 2 times only)

In a large bowl, beat egg whiles until soft peaks form; beat in sugar until ribbons fall from beaters when lifted (2-3 minutes)

Stir in almonds, flour, extract and baking powder; don't worry about deflating the egg whites

Preheat oven to 350F

Drop level teaspoons of batter onto prepared baking sheet two inches apart; using fingertips, tap each into tidy circle shape

Bake in center oven for 9 minutes, turning sheet at halfway point, until crisp on top and light brown on the bottom; set pans on cooling rack and cool 2 minutes

Sprinkle with icing sugar, if desired