Preheat the oven to 350° F (180° C.) Grease 3 9-inch cake pans and line them with parchment circles, then grease the parchment as well and coat the insides of the pans with flour. You can also use a nonstick baking spray with flour.
In a large bowl, stir the flour, baking powder, salt, cinnamon, nutmeg, ginger, cloves, allspice, and mace or pepper. Continue stirring until well combined.
In another large bowl, whisk together the brown sugar and oil until fully combined. Add the eggs one at a time, whisking until each one is fully incorporated. Whisk in the vanilla.
Add about 1 cup of flour, whisking until it is only just incorporated, then whisk in about 1/2 cup of milk. Continue whisking in the flour and milk alternately until the batter is fully combined, being careful not to overmix.
Pour the batter evenly into the 3 prepared pans and bake at 350° F (180° C) for about 24-27 minutes, or until the tops of the cakes spring back when touched. Remove from the oven and allow the cakes to cool for at least 45 minutes before frosting.