Pour 55g of aged egg whites into the bowl of a stand mixer with a whisk and mix on a medium speed until the surface of the egg whites is covered in small bubbles. Add in a pinch of cream of tartar and continue to mix until it reaches the soft peak stage.
Add 55g of granulated sugar into the eggs and mix on a medium speed for 30 seconds then increase the mixing speed to a medium high speed. Keep mixing until stiff, glossy peaks form.
Sift 63g superfine almond flour, 63g powdered sugar and 7g crushed Oreos into the meringue.
Fold the dry ingredients into the meringue using a circular motion until a thick ribbon of batter runs off the spatula when it's lifted. Fold until a thick ribbon of batter runs off the spatula when it is lifted. You should be able to draw a couple figure 8's with the batter running off your spatula when it is the right consistency. If the stream of batter breaks before you're able to this, you may need to stir it a bit more.
Pour the batter into a large piping bag fit with a medium-sized round piping tip and pipe 1 1/4 inch rounds on the prepared baking sheets, spacing them about 1 inch apart.
Bang the pans firmly on the counter a few times to release air bubbles, then pop any remaining air bubbles that come to the surface with a toothpick.
Let the macarons rest for 30 minutes, or until they develop a skin. The macarons should look matte once the skin has formed. While the macarons rest, preheat the oven to 315 F / 157 C.
Bake one tray of macarons at a time on the middle rack of your oven for 15-18 minutes and rotate your pan halfway through.
Remove from oven and let the macarons cool on the pan (about 15 minutes), then gently remove them from the silpat mat.