Do you know the reason your cake flopped?

Your cake was too far from the oven walls

You used brown sugar

The temperature was too low

You used too much baking powder

The batter was under-mixed

You did not use enough baking powder or flour

The temperature was too low

You used too little flour or baking powder

You used too much liquid in your batter

You let it cool partially in the pan and then transferred it to a cooling rack

You made a mistake with the cake's recipe

Your cake was too cold

That's how fondant is supposed to be...

You refrigerated it

Your oven temperature was too high

You used too little baking powder

You used room temperature egg whites

You used a whisk instead of a fork