Preheat oven to 350 degrees F and grease and flour a 9x5 loaf pan
In a medium mixing bowl, combine the flour, light brown sugar, baking soda, ginger, cinnamon, allspice, nutmeg and salt; whisk to combine
In a separate bowl, whisk together the melted butter, molasses, eggs, buttermilk and vanilla extract until combined
Whisk the wet ingredients into the dry ingredients until fully combined
Pour the batter into the prepared loaf pan and bake for 40-45 minutes or until a cake tester comes out clean
Allow the bread to cool completely before removing the bread from the pan