Preheat the oven at 170ºC/340ºF conventional oven and line 2x 20 cm/8 inch baking pan with parchment paper.
In a large bowl, stir together the all-purpose flour, dark brown sugar, baking powder, baking soda, salt and spices.
315 g all-purpose flour, 150 g dark brown sugar, ¾ tsp baking powder, ¾ tsp baking soda, ¾ tsp salt, 2 ¼ tsp ground ginger, 2 ¼ tsp ground cinnamon, ½ tsp ground nutmeg, ½ tsp ground cloves
In another mixing bowl add all of the wet ingredients, and with a hand whisk, whisk them together until combined.
165 g unsulphured molasses, 360 g sour cream 14-18%, 110 g vegetable oil, 3 large eggs , 2 tsp vanilla extract
Pour the wet ingredients into the dry ingredients. Stir it all together with a whisk or a rubber spatula. Make sure there is no dry flour left in the batter.
Pour the cake batter into the prepared baking pans and spread the cake batter into an even layer. Bake them for 28-30 minutes or until a cake tester comes out clean.
Let the cakes cool on a cooling rack. After 5 minutes, gently remove the cakes from the cake tins and let the cakes cool down completely.