Preheat the oven to 150 Deg C.
Line a square baking tray with parchment paper.
In a heavy bottom pan and add in the butter, sugar and golden syrup.
1 Cup - 120 grams - Unsalted Butter, 1 Cup - 200 grams - Light Brown Sugar, 2 tablespoon golden syrup
On a low flame melt the butter, sugar, and golden syrup.
When the butter starts melting, mix all the ingredients slowly using a wooden spoon or a spatula.
Once the ingredients are all mixed together and you see it start bubbling, switch off.
Add oats.
2.5 cup - 250 grams - Oats
Add nuts and seed mixture if, using.
¼ Cup Mixed nuts and seeds - Optional - I have used a combination of Sultanas
Mix everything and pour the mixture on a baking tray.
Spread the mixture and dab it with the back of the spoon to form a uniform layer or around 1 cm thickness.
Bake it in a preheated oven for 40 minutes.
Do check the flapjacks after 30 minutes. At times it is not done in 30 minutes and one needs to bake it a little longer.
Once done, remove and let it cool for 5 minutes.
Cut into the desired shape, when it is slightly warm.
Now let it cool completely and store it in an air-tight container.