Pre-heat your oven to 160C Fan/180C/350F/Gas Mark 4, grease and line a 12" x 9" traybake tin
To make the sponge, mix together the oil and light brown sugar until smooth
Then whisk in the eggs and pumpkin puree
Then whisk in the self raising flour, cinnamon, mixed spice, ginger and nutmeg
Pour the mixture into the tin and bake for 25-30 minutes or until a skewer inserted in the centre comes out clean. Leave to cool fully
To make the cream cheese frosting use an electric hand whisk to mix together the butter and icing sugar, when they start to come together, add the cream cheese and vanilla extract and mix until smooth
Spread the frosting on top of the sponge, then add sprinkles of your choice
To serve, slice into squares. Store any leftovers in the fridge and eat within 3 days
Notes
If you can't get hold of pumpkin puree you could also use grated raw pumpkin, or butternut squash would work too. You can also roast or steam the pumpkin, then puree it and let it cool completely before adding to the mix.Mixed spice is a British spice blend containing Cinnamon, Coriander Seed, Nutmeg, Clove, Pimento, Ginger.If you live in a place where pumpkin pie spice mix is easily available, then you can use 3 tsp of that instead of the mix of spices I've listed in the recipe.