Pre-heat your oven to 160C Fan/180C/300F/Gas Mark 2 and line a 12" x 9" traybake tin with baking paper
In a pan on a low heat, melt the together the butter, light brown sugar, black treacle and golden syrup
In a large bowl mix together the oats, plain flour, baking powder, ground ginger, mixed spice, nutmeg and salt
Pour the warm treacle mixture into the bowl and combine the ingredients
In a small bowl beat the eggs with the milk. Add them bit by bit to the rest of the mixture, mixing in well each time
Pour the mixture into the lined tin and bake for 35 minutes. It must be firm on top all the way to the centre
Allow to cool, then cut into squares. You can eat it immediately or for a stickier cake, put it into an airtight container and leave for 3 - 5 days
Notes
Make sure all your ingredients (particularly the eggs) are at room temperature before you start baking. The butter/baking spread can be cold as you're going to melt it anyway, it will just take a bit longer to melt.
You can use either baking spread or butter for this recipe.
If you can, do use light brown soft sugar for this recipe. You can use caster sugar if you can't get hold of it.
Mixed spice is a British spice blend containing cinnamon, coriander seed, nutmeg, clove, pimento, and ground ginger. If you can't get hold of it where you're based, you can use a Pumpkin Spice mix instead or add more of the other spices.
Golden syrup is sold all over the world, so check the international section in your supermarket if you're not based in the UK. You can also buy it online from Amazon. If you can't get hold of it, light corn syrup or glucose syrup are the closest things to it, however I've not tested this recipe with them. Please note, you will not get the same results if you omit the golden syrup.
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.