Preheat oven to 325°F. Grease and line two 9-inch round cake pans with parchment paper. If using cake strips, soak them in ice-cold water now.
In the bowl of a stand mixer fitted with the paddle attachment, combine flour, dark brown sugar, baking powder, salt, and all the spices (cinnamon, cardamom, ginger, allspice, nutmeg, cloves).
Cut butter into small cubes and add to the dry ingredients. Mix on low speed until the mixture resembles wet, crumbly sand.
Add the neutral oil, whole milk, eggs, and vanilla. Mix on low to medium speed until just combined and smooth. Do not overmix.
Divide the batter evenly between the two prepared pans. Scrape all batter from the bowl.
Wrap the soaked cake strips tightly around the outside of each pan.
Bake for 35–40 minutes, or until a toothpick inserted in the center comes out clean.
Immediately turn cakes out onto a wire rack and cool completely.
Once fully cooled, wrap each cake layer in plastic wrap and freeze for at least 2 hours before decorating.