The improper dough can cause your cake and doughnut will get hard and absolutely make you loss appetite to eat it.So if you want to make a cake and to avoid the problem,what about you bast your flour under the sun,before you start.The results is,your flour texture will become lighter and can make your dough soft.

And for your doughnut,mix two to three potato that you have been braise and mash into your dough.The result is your doughnut will become soft and delicious even it getting cold.

Try It.