Line 2 large baking sheets with Silpat mats or parchment paper. Fit a piping bag with a small round tip (like a Wilton #10).
Create a simple double-boiler by setting a heatproof bowl over a small saucepan of simmering water.
Add the egg whites and granulated sugar to the bowl. Whisk constantly until the sugar has fully dissolved, about 3-4 minutes.
3 large egg whites, ½ cup granulated sugar
Transfer the egg white mixture to the bowl of a stand mixer fitted with the whisk attachment. Beat on medium-high speed until they form stiff peaks, about 5 minutes.
Sift the powdered sugar and almond flour into the beaten egg whites. Fold the mixture gently to incorporate the dry ingredients into the egg whites.
⅘ cup powdered sugar, 1 cup almond flour
Gently fold the dry ingredients into the egg whites by making a J shape with your spatula. Make sure to fold all the way to the bottom of the bowl!
Once all of the dry ingredients have been incorporated, continue to fold the meringue but this time gently smush the batter against the sides of the bowl before folding it back together.
Continue to smush and fold the meringue a few times before testing to see if it has reached the Lava/Figure 8 stage. The meringue is ready to pipe when you can draw a figure 8 without the stream breaking-- it should flow smoothly and continuously.
When the batter flows smoothly, transfer the mixture to the piping bag. Pipe 1-inch circles about 2 inches apart on the prepared baking sheet.
Immediately after you’ve finished piping the tray, hold it 6 inches off the counter and drop it straight down to release any air bubbles. Repeat the dropping process 5-6 times, or until it looks like any large air bubbles have popped.
Set the tray aside to rest for 20-25 minutes, or until the macarons have developed a skin. The macarons are ready to bake when they can be gently touched without sticking to your finger.
While the macarons rest, preheat your oven to 325°F.
Bake the macarons one tray at a time for 13 minutes, turning the tray halfway through baking.
Allow the macarons to cool on the tray. Once they are fully cooled, they can be filled and aged.