Preheat the oven to 350 degrees F. Prepare a 8.5 x 4.5 inch loaf pan by greasing and lining it with parchment paper for easy removal. Set aside.
In a large mixing bowl, add all-purpose flour, baking soda, baking powder, ginger, cinnamon, cloves, nutmeg and salt. Whisk until thoroughly combined.
235g (1 3/4 c) flour, 6g (1 tsp) baking soda, 2g (1/2 tsp) baking powder, 3g (1 1/2 tsp) ginger, 2g (1 tsp) cinnamon, 1g (1/4 tsp) cloves, 1g (1/4 tsp) nutmeg, 3g (1/2 tsp) salt
In a liquid measuring cup, add the hot water (no hotter than 100 degrees F) and molasses. Whisk until smooth.
120g (1/2 c) hot water, 200g (1/2 c) molasses (not blackstrap molasses)
In a separate bowl, add the brown sugar, oil, sour cream, egg, sourdough discard, vanilla and the molasses mixture. Whisk until smooth.
110g (1/2 c) light/dark brown sugar, 40g (1/4 c) neutral oil, 140g (1/2 c) sour cream, 1 egg, room temperature, 120g (1/2 c) sourdough discard, 4g (1 tsp) vanilla
Pour the wet ingredients into the dry ingredients and use a rubber spatula to mix until just combined! Careful not to over mix the batter, otherwise this can lead to a dense quick bread. The batter will be thin.
You can store this batter in the fridge overnight to long-ferment before moving on to the next step.
Pour the quick bread batter into the prepared loaf pan and bake for 50-60 minutes, or until a toothpick put in the center comes out clean or with a few moist crumbs.
Leave the quick bread in the loaf pan for 10 minutes before removing it to cool completely on a wire rack. Cool for at least 2 hours for the easiest slicing.
In the meantime, prepare the cream cheese frosting. To a bowl of a stand mixer with the paddle attachment, add the softened cream cheese, softened butter, maple syrup and vanilla extract. Beat on medium speed for 2-3 minutes or until light and fluffy.
113g (1/2 c) cream cheese, softened, 26g (2 T) unsalted butter, softened, 260g (2 c) powdered sugar, 40g (2 T) pure maple syrup
This can also be done with a hand mixer. And for the best flavor, opt for pure maple syrup over pancake syrup.
Scoop the cream cheese frosting on top of the cooled loaf and spread evenly with an offset spatula. Slice and enjoy!