How do I prevent my sponge / biscuit from creating a domed top?

The reason for the spherical /dome baking of sponge has various causes.

An oven that is too hot will pull the biscuit batter up too quickly. Biscuit is an airy composition and warm air rises when heated.

Depending on the oven used, the correct temperature must be found. The temperature for baking biscuit is about 180 ° C.

By placing the biscuit (in the form) on the bottom of the oven on the wire rack and placing a second wire rack in the middle of the oven with an empty cake tin on top that is a little smaller than the tube cake tin, the rising heat in the middle is broken : the middle remains lower and the biscuit bakes higher on the side.