Preheat oven to 350°F (180°C) conventional (see note 3 if using a convection oven with a fan) and lightly grease a 9x13-inch cake pan. Line the pan lengthways with parchment paper, leaving some overhang on the sides to make it easier to lift the cake out later. Set aside.
In a medium bowl, sift together all-purpose flour, baking powder, baking soda, salt, ground ginger, cinnamon, cloves, and nutmeg. Using a whisk, mix until well combined and the spices are evenly distributed throughout the flour. Set aside.
In a separate large bowl, combine light brown sugar, vegetable oil, molasses, eggs, and vanilla. Whisk until smooth and well combined.
Add the pre-sifted dry ingredients to the wet ingredients and gently fold together using a spatula until just combined. Be careful not to overmix. The batter will be quite thick at this stage, which is completely normal.
Pour the hot coffee into the cake batter and using a whisk, mix until smooth and just combined. Again, be careful not to overmix.
Pour the batter into the prepared cake pan and gently tap the pan on the counter a few times to remove any large air bubbles.
Bake for 20–22 minutes, or until a toothpick inserted into the centre comes out clean or with a few moist crumbs attached.
Allow the cake to cool in the pan for about 30 minutes. Carefully run a thin knife along the edges without parchment paper, then use the parchment overhang to lift the cake out. You can also leave the cake in the pan and serve it directly from there if you prefer. In the meantime, prepare the butterscotch molasses sauce.