Melt the butter, sugar and golden syrup together in a large saucepan over a gentle heat.
Stir in the cinnamon.
Stir in the porridge oats until thoroughly coated with the syrupy mixture.
Add the chopped apple pieces and stir.
Spoon the mixture into your prepared baking tin.
Use the back of a metal spoon to press the mixture firmly into place.
Bake in the preheated oven for about 25 minutes until the flapjack is golden brown.
Leave to cool completely in the tin. Turn it out and use a sharp knife to slice it into pieces.
Store in an airtight container for up to 4 days.
Notes
Nutritional information is only an approximate guideline. Calculations will vary according to the ingredients you use and your cooking methods.Do read my post for additional tips and tricks to ensure a successful bake!