Preheat your oven to 160°C fan (180°C conventional). Grease and line a baking tray with parchment paper.
In a large saucepan, gently melt the plant butter, golden syrup, and light brown sugar over a low heat. Stir until smooth and glossy.
Remove the pan from the heat and stir in the flour and oats. If you’re feeling fancy, now’s the time to fold in any optional extras like desiccated coconut, chocolate chips, hazelnuts (or other nuts), or dried fruit.
Spoon the mixture into your prepared tray, spreading it out evenly. Use the back of a spoon to press it down firmly—this helps to create that perfect chewy texture.
Bake for 25–30 minutes, or until the edges are golden and the centre is set.
While the flapjack is still hot, score it into portions with a sharp knife. This makes cutting easier later on. Leave it to cool completely in the tray before slicing and serving.
