overipe bananas

Hubby bought some bananas in the afternoon, by evening, bananas are getting over ripe, not to waste it, decide to do banana chiffon cake. I like chiffon cakes, not too heavy and can be a light snack and easily digest. Did not have corn oil, I used butter to substitute and never before have I use butter to bake chiffon and this is my first time. Oh Boy! glad that the cake was baked well.
Seeing too may methods of beating egg white meringue and I always try to apply the new techniques in baking my sponge cakes and the results... :(.. fail,collapse or sunk in the middle.
This time round, go back to the basics and I have learnt that in whatever method you learnt doesn't apply to all cakes. Have to infused the theory into my brain.