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Line a 8x12 inch tray bake tin with baking parchment or foil.
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Prepare the crumble layer first by rubbing the butter into the flour, stirring in the sugar and popping in the fridge to keep cold as you make the cake.
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Beat the butter and sugar together until very light and then beat in the eggs one at a time, using a spoonful of flour if needed to prevent curdling.
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Sift over the remaining flour and raising agents and fold into the creamed butter and eggs. Stir in the milk to loosen the batter a little. Stir through the nuts and scrape into your prepared traybake tin - it will be stiff and look a mean amount but it does puff beautifully with all those eggs and raising agents.
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Prepare your apples and pop the oven on to preheat at 180˚C.
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Peel your apples, core them then chop into 1 cm sized cubes (roughly) and place in a large bowl - toss with the cinnamon and sugar for the apple layer and then tumble over the cake batter layer.
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Sprinkle over the prepared crumble, stud with the fudge and bake for approx 45 minutes until very well risen, browned and a skewer in the centre of the bake doesn't have too many crumbs stuck it.
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Cool for 15 minutes in the tin before slicing and serving.