Preheat oven to 350°F. Grease an 8½ x 4½-inch loaf pan and line with parchment paper.
In a medium bowl, whisk together flour, cinnamon, nutmeg, ginger, cloves, baking soda, and salt. Set aside.
In a large bowl, combine the granulated and brown sugars, pumpkin purée, sourdough discard, vegetable oil, and egg. Whisk until smooth.
Add the dry ingredients to the wet ingredients and stir until combined.
Pour the batter into the prepared pan and spread evenly. Bake for 60-65 minutes, until a toothpick inserted in the center comes out clean.
Remove from the oven and let cool for 10 minutes in the pan. Then remove the loaf from the pan (you can lift it up with the parchment paper) and transfer to a cooling rack to cool for at least an hour.
Once the bread is cooled, make the glaze. Whisk together the powdered sugar, vanilla extract, and milk. Pour the glaze over the loaf to coat, then slice and enjoy!
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Notes
While it's not needed for leavening purposes, if you prefer, you can use active sourdough starter instead of sourdough discard in this recipe.If you'd like a version of this recipe with chocolate chips, try my Sourdough Discard Pumpkin Chocolate Chunk Bread!