Banana streusel snack cake

I’m not a huge fan of Jamie Oliver’s recipe names style like “the best ___ ever”, “the ultimate ___”, and so on – taste is such a subjective thing, something fantastic for some people might not be all that for others.
But if you allow me, I’ll be a walking contradiction today and tell you that this is the best banana cake I have ever eaten – it’s a good thing my grandma doesn’t read my blog. :D