Step 1: Preheat your oven to 350°F (175°C) and grease a 9x5 inch loaf pan thoroughly.
Step 2: In a medium bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, and nutmeg until well combined.
Step 3: In a large bowl, beat the granulated sugar, brown sugar, and vegetable oil together until smooth.
Step 4: Add the eggs one at a time to the sugar mixture, beating well after each addition. Stir in the mashed sweet potato, fresh ginger, and vanilla extract.
Step 5: Gradually add the dry ingredients to the wet ingredients, stirring just until combined. Do not overmix the dense sweet potato loaf with orange ginger glaze batter.
Step 6: Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Step 7: Bake for 55 to 65 minutes, or until a toothpick inserted into the center of the dense sweet potato loaf with orange ginger glaze comes out clean.
Step 8: Allow the loaf to cool in the pan for 10 minutes, then transfer to a wire rack.
Step 9: While the loaf cools, whisk together the powdered sugar, orange juice, orange zest, and grated ginger in a small bowl to create the glaze.
Step 10: Drizzle the orange ginger glaze over the warm dense sweet potato loaf with orange ginger glaze and let it set before slicing.