Pre-heat your oven to 160C Fan/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, smooth it out into an even layer, 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
To make the cinnamon sugar, mix the ingredients together
Spread the frosting on top of the sponge, then add fondant pumpkins and the cinnamon sugar, or other decoration of your choice
To serve, slice into squares. Store any leftovers in the fridge and eat within 3 days
Video
Notes
Make sure all your ingredients (particularly the eggs) are at room temperature before you start baking.
I used unsalted butter and Philadelphia cream cheese for the cream cheese frosting.
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. I live in the UK so pumpkin spice mix is not something that's sold here.
I really recommend using light brown soft sugar if you can for the cake, but if you can't get hold of it, caster sugar will work well too.
I decorated the traybake with a few leftover fondant pumpkins from making my Pumpkin Spice Cake.
Although I provide cup measurements, I highly recommend weighing your ingredients out using digital kitchen scales. It is the most accurate way to measure ingredients and will ensure the best results. Digital scales are very low cost and can be purchased for around £12 ($16.50).
For teaspoon (tsp) and tablespoon (tbsp) measurements, please use measuring spoons and not the type of spoons you eat with. Again this will ensure accuracy and provide the best results.