Preheat oven to 325 degrees F. Grease and flour one 9×5 inch loaf pan.
In a large bowl, whisk together the flour, sugar, brown sugar, baking powder, cinnamon, cardamom, cloves, nutmeg, allspice, ginger, and baking soda; set aside.
In a medium bowl, whisk together the egg, milk, molasses, maple syrup and oil. Stir into the dry ingredients just until moistened. Pour into prepared loaf pan. Sprinkle walnuts in a 2 1/2-inch-wide strip down center of loaf.
Bake 60-70 minutes or until a toothpick inserted near the center comes out clean. Cool for 10 minutes before removing from pans to wire racks.