Take the puff pastry out of the fridge about 10 minutes before processing. Mix pudding powder and sugar. Stir with 6 tablespoons of milk until smooth. Bring the remaining milk and whipped cream to the boil, stir in the pudding powder.
Cook for about 1 minute. Remove from the heat, pour into a bowl and cover with foil directly on the surface. Let it cool down.
Unroll the puff pastry, roll out a little wider and cut out a circle (approx. 25 cm Ø). Line a springform pan (20 cm Ø) with it, pressing down the edge. Cover dough with baking paper and fill in dried peas.
Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 20 minutes. Remove baking paper and dry peas and bake for another 5 minutes at the same temperature.
Remove, allow to cool for about 10 minutes, remove from the mould and allow to cool.
Let the blueberries thaw a little. Sprinkle the almonds over the cake base. Pour the pudding into the mould and spread the blueberries on top. Crumble the cantuccini and sprinkle over it. Dust with icing sugar.