In a large mixing bowl, mix together the mashed bananas, water, vanilla extract, brown sugar, baking powder, baking soda, salt, cinnamon, nutmeg and chocolate chips (everything except for the vital wheat gluten).
Once this is well mixed, add in the vital wheat gluten and combine. Do NOT over-mix this, or you will end up with a chewier texture. The dough should be a little loose but able to form a cookie shape. The dough should not be wet and sloppy - if it is, add a bit of extra vital wheat gluten until the dough looks like the picture shown in the detailed instructions below.
Place the dough in a parchment paper-lined loaf pan. Spread it out as evenly as possible.
Cook for 45 - 50 minutes until you pass the clean toothpick test!