add the egg and beat until light and slightly fluffy. add the remaining ingredients and continue to mix for about 30 seconds. scrape down the bowl and beat for another 30 to 60 seconds.
pour the mixture into the three prepared pans. i find it useful to use a kitchen scale to evenly distribute the batter among the pans. the batter will be thick, so spread it out as evenly as possible in the pan. then, lift each pan and tap down on the counter 5 to 10 times to make the batter as flat as possible. place the pans in the oven and bake for about 25 to 30 minutes 