Pre-heat your oven to 160C Fan/350F/Gas Mark 4 and line a 8" square tin with baking paper. I grease the tin first with a little butter to help the paper stick to it
In a large mixing bowl, measure out the porridge oats, add the salt, and stir together
Put the butter, golden syrup and light brown soft sugar into a medium sized saucepan on a low heat until the sugar has dissolved and everything is melted. Stir it all together as it melts
Add the butter and sugar mixture to the bowl of oats and stir it in until all of the oats are fully coated
Spoon half of the mixture into the lined tin and use the back of a spoon or a silicone spatula to smooth it out and make it all an even layer. Add the cherry jam in an even layer over the oats. Spoon the remainder of the oat mixture over the top of the cherry jam and smooth out into an even layer
Bake for 20-25 minutes until they are golden brown all over, then leave to cool fully in the tin. They will not look set when you get them out of the oven, but they will firm up as they cool down
Remove from the tin and use a sharp knife to slice the flapjacks into squares. Make the icing by mixing the ingredients together until you have a smooth paste. Spoon or pipe it over each flapjack, then add a glace cherry half while the icing is still wet. Leave the icing to set before serving
Store in an airtight container in a cool place and eat leftovers within 1 week
Notes
I used unsalted butter for the flapjacks, you can also use a baking spread like Stork, or a dairy free spread.
I really recommend using light brown soft sugar if you can for the flapjacks, but if you can't get hold of it, caster sugar will work too.
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 (see link in my recommended ingredient section further below). If you can't get hold of it, you can replace it with maple syrup or honey.
I used a cherry jam for the filling, but another jam like strawberry or raspberry would work well too.
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.