Preheat the oven to 350˚F
In a large bowl, cream the sugar and butter until light and fluffy. Add the bananas, vanilla, eggs and baking soda mix, and mix until fully combined.
In a medium bowl, mix together the flour, baking powder, cinnamon and nutmeg. Slowly pour the dry ingredients into the wet ones, mixing until fully incorporated.
Pour the batter into a lightly sprayed loaf tin and bake for around 55-60 minutes, or until a toothpick inserted comes out clean.