Measure almond flour, powdered sugar and Oreo cookies crumbs.
Sift this mixture through the fine sieve 2-3 times.
From egg whites and sugar make French meringue.
Add dry ingredients into French meringue and fold with spatula until "lave consistency".
Transfer macaronage into pipping bag with round tip and pipe macaron shells.
Slam the baking tray a few times on the counter top to remove bubbles.
Let macaron shells to "dry" for 10-15 minutes (or more).
Bake at 275F (134C) for 12-14 minutes.