Preheat oven to 350 degrees. Spray a rimmed baking sheet with non-stick cooking spray, or butter as I did. Set aside.
In a medium mixing bowl whisk together flour, baking powder, baking soda, salt, cinnamon, nutmeg, ginger, and cloves, and set aside.
In a large mixing bowl combine the granulated sugar and brown sugar together until the mixture is fully combined, ensuring there are no clumps of brown sugar. If there are any clumps, break them up firmly with your fingertips.
Next, mix in melted butter and oil. Blend in eggs one at a time. Add in pumpkin puree, vanilla, and milk and blend until combined.
Add in flour mixture and mix until combined. Scrape down the sides and bottom of the bowl and fold the batter several times with a spatula to ensure it’s evenly incorporated.
Pour batter into prepared baking dish and spread into an even layer. Bake in preheated oven until a toothpick inserted into the center comes out clean, about 20 – 25 minutes.
Allow the cake to cool completely. Meanwhile, Prepare the Frosting!