Add the second third of the almond flour mixture to the egg whites and gently fold it in again.
Sift in the remaining third of the almond flour mixture and fold it in one last time. at this point, the cookie dough should have a thick paste-like texture.
Use a medium-sized cookie scoop to scoop out mounds of the cookie dough and place them into a plate of granulated sugar. Roll the scoop of cookie dough into the sugar, then take it into your hands and round it out to a ball.
Drop the ball into a bowl of powdered sugar and evenly coat it.
10. Place the cookies onto a baking sheet lined with parchment paper and lightly press each cookie with your hand or the bottom of a flat cup. Bake at 325 degrees Fahrenheit for 20-25 minutes.
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Notes
These cookies can be frozen before they are baked. Just make the cookies up until they are ready to go into the oven, then place them on a baking sheet, and freeze them for 1 hour. Then transfer to a ziplock bag. Thaw for 30-60 minutes then dust with fresh powdered sugar before baking per the recipe instructions.
Don't substitute the flour- Unfortunately, you cannot use all-purpose flour in place of the almond flour. It will change both the flavor and the texture of these cookies too much.
Make sure to beat the eggs to stiff peaks- Doing this ensures that the cookies will be aerated enough not to fall flat and spread.
If the dough is too sticky- If this happens because your eggs were larger or your flour coarser, then add equal amounts of almond flour and sugar to the dough until it's easily rolled.