After adding flour, the stirring time should not be too long. Just mix well without obvious particles. Before entering the oven, shake it on the table twice to shake off the bubbles formed by the stirring air.

The cake liquid itself should not be too thin. If it's too thin, it won't rise too flat. If it is too dry, it will harden and affect the taste. Shake out the hot water in time after baking, or the cake will collapse soon.