Preheat the oven to 170°C. Line a loaf pan with parchment paper.
Mix the dry ingredients in a bowl then add the eggs, banana, oil, syrup and vinegar. Combine until you get a smooth batter. Fold in chocolate chips.
Transfer the batter to the loaf tin, spreading it out evenly.
Bake in the middle of the oven for approx.45 minutes until golden brown and an inserted skewer comes out clean. You might need to cover it with foil, if it browns too quickly.
Cool in the pan for 15 minutes, then transfer it to a wire rack to cool completely.
Store it in a tin to keep it moist.