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Place the margarine, sugar, gluten free flour and cinnamon in a bowl and crumble together with your hands, as it combines it will start to come together in a ball which is what we want, it should come together as a nice dough.
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Grease and line a 8x8 inch square cake tin and press the dough in with your fingers. Bake your gluten free shortbread on gas 4/180c for 15 mins until starting to go golden. Remove from the oven.
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To make the caramel, break the butter into a pan and add the sugar, place on a low heat and melt together until all dissolved and combined together.
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Pour in the condensed milk, stirring continuously, bring to a boil and allow to boil for 1 minute. Remove from the heat and let cool slightly.
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Thinly slice your apple, I find it best to use a mandolin to get them as thin as possible.
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Pour 1/3 of the caramel onto the shortbread and spread over, add a layer of apple on top, add another 1/3 of the caramel and more apple, finish with the last of the caramel.
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Place the crumble ingredients in a bowl and rub together with your fingers to get a nice crumb, scatter on the top of the caramel and turn the tray back to the oven for 25 mins on gas 6/200c
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Remove from the oven and let cool, when room temp place in the fridge to let the caramel fully set, best to leave overnight to be sure it is fully set and cooled! Slice into 16 pieces and serve!

