Preheat the oven to 350F (180C). Lightly grease and flour a 9x13 inch (23x33 cm) baking pan.
In a large bowl, whisk together the flour, cinnamon, ginger, nutmeg, cloves, baking powder, baking soda and salt. Set aside.
In a separate large bowl, beat together the oil, brown sugar, granulated sugar, eggs, vanilla, orange zest and pumpkin puree. This can also be done by hand with a wire whisk. When finished, there should be no lumps of brown sugar or pieces of egg.
Make a well in the middle of the dry ingredients and pour the wet ingredients into the well. Mix together until smooth. I always do a few stirs by hand with a wire whisk first, then whisk until smooth. Alternatively, you could do a few stirs by hand first, then beat with an electric mixer.
Pour the batter into the prepared pan and smooth the top. Bake in the middle of the preheated oven for about 35-40 minutes.
Cool the cake in the pan. If you'd like to speed up the process, after about 30 minutes place in the fridge. I recommend placing a cooling rack on the shelf (because the bottom of your pan will still be warm), then placing the cooling rack on top.