Preheat the over to 350*
Grease a 13x9 inch pan with a bit of butter and set aside
In a medium sized bowl, whisk together the flour, baking soda, baking powder, cinnamon, nutmeg and salt and set aside.
In a larger mixer, cream the softened butter for 1-2 minutes
Add in the brown sugar and beat until creamy
One at a time, add in the eggs
Once well incorporated, add in both the vanilla and rum extract
Add in the mashed bananas and mix well
Next add in the flour and milk to the batter, alternating each addition
Pour the batter into the prepared 9x13 inch pan
Bake for 40-50 minutes until a cake pin inserted into the center comes out clean
Place the cake on a wire rack to cool completely.
Once cooled, ice with Dollop frosting
To serve, slice the cake and drizzle with caramel sauce