Macaronge the batter with either a flexible spatula or large spoon. You’ll want to mix until the powdered sugar mixture is fully incorporated into the egg whites, so take extra care to scrape the bottom of the bowl. Some say it takes about 50 strokes and will look like honey or lava when finished. If you make a peak with the batter it should take about 20 seconds melt back down and if you lift your spatula from the batter it should fall off in a smooth line, with minimal breakage. It should not be too thin or watery, that means you’ve overmixed it.