Combine almond flour, powdered sugar, and granulated sugar in a medium bowl. Sift or whisk to break up any clumps and evenly distribute.
2½ cups blanched almond flour, 6 tbsp powdered sugar, ⅔ cup granulated sugar
In a large metal or glass bowl, beat aquafaba with salt using electric beaters or a stand mixer on medium-high speed until soft peaks form, about 5 minutes.
½ cup aquafaba, ¼ tsp salt
Gently stir in lemon zest. Fold in almond flour mixture until completely combined, then stir in amaretto. The dough will be sticky and soft, but possible to form into a ball.
1 tsp lemon zest, 1 tbsp amaretto liqueur
Cover the dough and chill for at least 30 minutes, longer if it is a warm day.
Preheat oven to 325°F/160 C. Line baking sheets with parchment or silicon baking sheets.
Once dough is chilled. Place powdered sugar for coating in a small bowl.
Powdered sugar to coat cookies
Using a teaspoon, scoop heaping amount of the dough (about 2 tsp balls). Roll between your hands until a ball forms.
Roll the dough ball in powdered sugar until completely coated. Place at least 2” inches apart on prepared baking sheets. Repeat with the remaining dough.
Place baking sheet on a rack in the up ⅓ of the oven – the bottoms are prone to overcooking. Bake for 18-20 minutes or until golden brown under the sugar.
Allow to cool on the baking sheet for at least 5 minutes before moving to a cooling rack to cool completely. Enjoy your cookies!