Pre-heat the oven to 180°C/350F fan.
Beat the butter and sugar until light and fluffy in a large bowl.
Add the eggs, flour and cinnamon and beat until well combined and there are no pockets of flour.
Fold in the apples by hand.
Line a 20cm x 20cm square tin with baking paper or parchment. Pour in the mixture, smoothing gently with a spatula. Sprinkle over you flaked almonds.
Bake for 30-35 minutes (check at 30 minutes).
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