With a little help from Mary Berry I have been making a banana loaf most weeks for the last two months or so. Since my Nutribullet 
I prefer my banana loaf less plain than the Berry version, so here is what I have been making:
Wet/blitzable ingredients
100 gr melted butter (using melted not softened makes the nutri vessel easier to clean)
175 gr caster sugar
2 eggs
2 bananas
1 other fruit – pear or apple?
good splosh of milk
generous teaspoon of mixed spice
Dry ingredients
225 gr SR flour
2 big handfuls of sultanas
a good sprinkle of nuts, eg walnut pieces, whole shelled hazelnuts
glacé cherries if you have them
Preheat the oven to 180 deg / 160 fan.
Line a 2lb loaf tin – I use Loaf Tin Liners
Put the dry ingredients in a bowl.
Blitz the wet ingredients in the nutribullet.
Pour the wet ingredients into the dry ingredients and stir well. Pour the batter into the loaf tin and bake for an hour.
Check after 45 minutes. If the cake is browning on top but still moist inside, cover with tin foil to stop the crust burning.
If after an hour the skewer is still not coming out clean – this is a moist, heavy cake, after all – turn the oven off and allow it cool with the cake still in.
Variations
The same fundamental method works with other fruit, not just bananas. I’ve tried a pear and chocolate cake by substituting three pears for the bananas and adding two tablespoons of cocoa into the flour.
Since the nutribullet means you can blitz any fruit into a liquid, rather than mashing bananas with a fruit, you can turn pretty much anything into a cake. On much the same basis that you can hide vegetables you don’t like in a nutribullet with fruit you do, you can also put vegetables into cake this way.
I don’t see the need to use baking powder as well as SR flour – too much and you end up with a cake that gives you heartburn.
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