Ive chosen to make a cake instead, so I added +1 egg, whipping the yolk and white separately and also put in the mixture together with the baking soda 1 tbsp of baking powder. Also, I put half plain flour half whole wheat flour.
Id recommend to reduce the amount of ingredients for the crumbs, I wanted to make a fit cake and with a those amount of flour and sugar is a no. Also, the amount of butter it asks for the curmbs might be too much since mine didn't turn in crumbs but a dough, I had to put more flour and sugar to correct that.
Although the crumbs wasn't a success, the cake turn out to be delicious.
Oh! in the banana misture, I did with half smashed and half sliced, which made the cake really moist.