Preheat the oven to 350 degrees F. Line the loaf pan with parchment paper and keep it aside.
In a mixing bowl, whisk together butter, molasses, banana, eggs, and vanilla extract until well combined.
½ cup Butter, ½ cup Molasses, 1 ½ cups banana, 2 Eggs, 1 teaspoon Vanilla extract
To this add flour, cinnamon, dry ginger, allspice, salt, baking powder, raisins, and mix until combined.
2 cups Flour, 1 tablespoon Cinnamon powder, 1 tablespoon Ginger, ¾ teaspoon Allspice, ½ teaspoon Salt, 1 tablespoon Baking powder, ½ cup Raisins
Transfer the batter to the prepared loaf pan.
Bake for 55 minutes or until a toothpick inserted comes out clean.