Once the mixture is light and fluffy, slow the mixer to its lowest setting and add 6 eggs, one at a time, only adding the next egg until the previous egg before it has been fully incorporated into the batter. Once all the eggs have been added, scrape down the sides of the bowl with a rubber spatula. Increase the mixer speed to medium-high and beat for another 2 to 3 minutes, or until the mixture is very light, creamy, and pale in color.