looks silky and smooth. scrape down the sides and bottom of the bowl.
add the flour mixture, and mix on low speed for about a minute until the dry ingredients are thoroughly moistened. scrape down the sides and bottom of the bowl again, and mix on low speed for another 45 seconds to make sure any remaining dry bits are well mixed.
pour into the prepared quarter sheet pan, and spread evenly with a spatula. bake for 30 to 35 minutes, until the cake is a deep golden brown and bounces back slightly when poked.
cool on a wire rack. once cooled, the cake can be wrapped in plastic wrap and stored in 