In a large mixing bowl, add the butter and brown sugar. Using an electric or stand mixer on medium speed, cream together for approximately 2 minutes until the mixture is light and fluffy.
½ (115g) cup 115g unsalted butter, 1/3 (73g) cup brown sugar
Add the sourdough discard, molasses, and vanilla to the bowl. Combine the rest of the wet ingredients on medium/high speed until everything is smooth and light.
¼ (60g) cup sourdough discard (cold or unfed), ¼ (60g) cup unsulphered molasses, 1 tsp vanilla extract
In a separate mixing bowl, whisk together the flour, cornstarch, ginger, cinnamon, cloves, cardamom, salt, cocoa powder, and baking soda.
2 (240g) cups all-purpose flour, ¼ (30g) cup cornstarch, 2 1/2 tsp ground ginger, 1 1/2 tap ground cinnamon, 1/8 tsp cardamom, ⅛ tsp ground cloves, ¾ tsp fine sea salt, 1 (6g) tbsp unsweetened cocoa powder, 1/2 tsp baking soda
Add the dry ingredients to the wet, and mix on low until the dough is combined and forms a ball. Remember to scrape down the sides of the bowl and mix everything at the bottom. This insures all your crackers come out evenly. This is a stiff dough, so get it mixed best you can until no flour streaks remain. Don't overmix the dough or the crackers will be tough.
Wrap the dough in plastic wrap, and pat down to form a cube of dough. Transfer to the refrigerator to chill a minimum of 2 hours, or for a longer fermentation you can chill the dough overnight.