Insert a chopstick or a thin stick into the cake and take it out to see if the chopsticks are dry (if they are not cooked, the batter will stick to the chopsticks)

The other is to pat the cake a few times with your hand to hear if there is any rustling. If so, it may be immature.

I generally look at these two methods.

You may bake so hard that the external coke is endogenous. When baking a cake, we should consider the power and the size of the cake, otherwise the eggs will not be fully distributed.