Preheat oven to Gas 4, 180ºC, fan160°C. Oil and line base of a 20x30cm (8x12in) cake tin with baking parchment.
Melt butter, caster sugar and golden syrup together in a pan, stirring until sugar has dissolved. Remove from heat and stir in oats and apples.
Spread mixture in tin and bake for 20-25 minutes. Cut into 12-14 bars; allow to cool before turning out of the tin.
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