Mix together flour, baking powder, salt, nutmeg and cinnamon and set aside.
Whisk together eggs, vanilla and rum and set aside.
Using a handheld mixer whisk together butter and 1/2 a cup of sugar until combined, be careful not to over whisk.
Replace the handheld mixer with a spatula.
Slowly fold in egg mixture.
Slowly fold in melted coconut oil, If you need to heat the oil to melt it, allow it to sit and cool for a while first before adding.
Fold in evaporated milk.
Fold in half of the flour mixture, then half of the mashed bananas, then repeat.
Fold in raisins.
Transfer cake mixture into loaf tin.
Slice banana into 1/2 inch slices then layer them into two rows.
Sprinkle with balance of dark brown sugar then place in preheated oven at 380.
Bake for 45 mins - 1 hour or until you are able to prick with a toothpick and it comes out clean.