Preheat the oven at 170ºC/ 340ºF conventional oven and prepare a 22x33cm (9in x 13in) sheet pan with parchment paper.
In a measuring cup, combine milk, and vanilla extract. In a bowl, sift and mix together the flour, cinnamon, all spice, nutmeg, ginger, baking powder, baking soda and salt.
350 g all-purpose flour, 2 teaspoon cinnamon, ¼ teaspoon all spice powder, ¼ teaspoon nutmeg powder, ¼ teaspoon ginger powder, 2 teaspoon baking powder, ½ teaspoon baking soda, ½ teaspoon salt, 80 g milk, 2 teaspoon vanilla extract
In the bowl of a stand mixer add the oil, brown sugar and granulated sugar and mix for 2 mins on medium/high speed. Add the pumpkin purée and mix it in until well combined.
200 g brown sugar, 100 g granulated sugar, 165 g vegetable oil, 400 g pumpkin purée
Scrape down the sides of the bowl and add one egg at a time and mix until combined on a low speed. Scape down the sides of the bowl again, to make sure it has all combined.
3 eggs
Continue by alternating between adding ⅓ of the flour mixture and ½ of the milk mixture, ending on the flour mixture. Mixing in each addition until just combined.
Pour the batter into the prepared sheet pan and bake for 30-35 min or until a cake tester comes out clean.
Remove from the oven and let it cool down. Once the cake tin is cool to touch take the cake out of the tin and let the cake completely cool down on a cooling rack.