Preheat oven to 170 degrees celsius (160 if using fan-forced).
Grease a rectangular loaf tin (if you're not using a non-stick loaf pan, you may also want to line it with baking paper).
Place the softened butter and brown sugar into a bowl. Beat with a stand mixer or hand-held beaters for 2 minutes on high or until pale and fluffy.
Mash the bananas into a small bowl.
Add the mashed banana and the eggs to the creamed butter mixture.
Beat for 30 seconds on high until well combined.
Sift the plain flour and bi-carb soda into the bowl.
Add the salt, vanilla extract and chocolate chips and fold together with a spoon.
Pour the mixture into the prepared tin.
Cook for 1 hour or until a skewer inserted into the middle comes out clean or with a few crumbs.
Thermomix Method
Preheat oven to 170 degrees celsius (160 if using fan-forced). Grease a rectangular loaf tin (if you're not using a non-stick loaf pan, you may also want to line it with baking paper).
Place the softened butter and brown sugar into the Thermomix bowl. Mix for 20 seconds, Speed 4. Scrape down the sides of the bowl and repeat for a further 20 seconds.
Add the bananas and mix for 5 seconds, Speed 5. Scrape down the sides of the bowl.
Add the eggs and mix for 5 seconds, Speed 5.
Add the plain flour, bi-carb soda, salt and vanilla extract and mix for 5 seconds, Speed 5. Scrape down the sides of the bowl and repeat for a further 5 seconds.
Add the chocolate chips and mix on Reverse, Speed 4, 5 seconds or until combined. Pour the mixture into the prepared tin.
Cook for 1 hour or until a skewer inserted into the middle comes out clean or with a few crumbs.
Video
Notes
* If you notice the banana loaf over-browning during cooking time, simply cover with foil and continue cooking.