Sift almond flour mixture over whipped egg whites, and gently fold it with a spatula until batter is just combined. Making french macarons is all about the technique. Run the spatula clockwise from the bottom, up around the sides and cut the batter in half. Count every fold for about 50 folds, and then start testing the batter on a small plate after every couple folds. To test, drop a small amount of batter on a plate. If the small peaks dissolve into the batter on its own in about 10 seconds, the batter is ready. If not, fold couple more times and test again. Be careful not to over-fold.