It can be ridiculously hard to spoon the batter into the small crevices of the donut pan. The best way to accomplish this with little to no mess (read: little to no clean up), is by using a large ziploc bag, a cup, and some scissors. First, take the ziploc bag, open it up and drape it over the large cup. This will open up the top of the bag so it is easier to fill. Then spoon or spatula the batter into the bag. Once the batter is in the bag, cut off the tip and use it like a frosting bag.