Add the butter and sugar to a large non-stick frying pan. Heat on low/medium until melted.
Once the butter has melted and the sugar begins to dissolve, add ground ginger, golden syrup and vanilla extract, stirring continuously to combine.
Fold the oats into the pan and stir until everything is incorporated.
Grease and line a baking dish (around 10 by 8 inches) with parchment paper and pour the flapjack mix into the dish. Use a spoon to spread the oats and once evenly distributed, use a spoon to press the oats into place until firm. Pop in the oven for 15 minutes
Allow to cool for 5 minutes and then cut into 16 pieces. Leave to cool completely and enjoy!
