Preheat the oven to 180ºc fan and line or lightly grease a 20cm (8-inch) baking tin or baking dish.
Add the mashed bananas, Greek yogurt, eggs, oil and honey if using, to a large bowl. Whisk until smooth and well combined.
Add in the flour, oats and sugar or honey if using.
Mix the dry ingredients into the wet ingredients until combined. Stir through the chocolate chips.
Smooth the top and sprinkle over the extra chocolate chips.
Bake for 30–35 minutes, or until golden and a skewer inserted into the centre comes out clean.
Allow to cool in the tin for 10–15 minutes before transferring to a wire rack. Slice into squares and serve.
