Preheat oven to 350 degrees. Butter a 8 x 8 cake pan.

Cream butter and maple syrup together. Add eggs and mashed banana and beat until well combined.

In a separate bowl, sift together flour, baking soda, baking powder, salt, and spices. Add the dry ingredients to the wet in three batches, thoroughly combining after each addition.

Fold in raisins and pour into prepared pan.

Bake for 30 to 40 minutes, until a cake tester comes out clean.