Step 1

Preheat oven to 170C/Gas mark 3.

Step 2

Grease the bottom of a 22 by 22cm baking pan with butter. Then place parchment paper over the top, pressing down at the corners. In a food processor, process the sugar, cinnamon and digestive biscuits until you have the texture of bread crumbs. Add the melted butter and pulse a couple of times to fully incorporate. Pour into the lined baking pan and gently pat down with the base of a glass. Bake in the oven for 12 minutes until golden. When done set aside to cool.

Step 3

Add cream cheese, eggs, lemon zest, lemon juice and sugar to the food processor and mix until well combined. It should have a smooth consistency. Pour onto the cooled base and then cover with blueberries. They will sink slightly but should still be half exposed -- as the cake bakes they will sink a little more and break down.

Step 4

Bake in the oven for 35 minutes or until the center only slightly jiggles. Remove from the oven and cool completely before refrigerating for at least 3 hours. Once set, remove from pan using the parchment lining and slice into 10 rectangular bars. Dust with icing sugar.

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