Preheat your oven to 350°F (175°C). Grease and flour a 9x5-inch loaf pan.
In a large bowl, whisk together the flour, baking soda, baking powder, cinnamon, nutmeg, ginger, and salt.
In another bowl, mix the granulated sugar, brown sugar, pumpkin puree, vegetable oil, eggs, vanilla extract, and buttermilk until well combined.
Gradually add the dry ingredients to the wet ingredients, stirring until just combined. Do not overmix.
Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Bake for 60-70 minutes, or until a toothpick inserted into the center comes out clean.
Allow the bread to cool in the pan for 10 minutes, then transfer it to a wire rack to cool completely.
While the bread cools, prepare the maple glaze by whisking together the powdered sugar, maple syrup, and enough milk to reach your desired consistency.
Once the bread is cool, drizzle the maple glaze over the top.