Place one sheet of puff pastry onto a lined flat tray. Prick all over with a fork to stop pastry rising too much. Cook in a hot oven, 200-220C till golden brown. Repeat with the second sheet. Allow to cool
Using a mixer, add the cream, milk and pudding powder into a bowl and mix till light, thick and fluffy. Spoon onto cooled pastry sheet, smooth out to edges and top with the other cooled pastry sheet.
Sprinkle with icing sugar and keep refridgerated till you need it. Use serrated knife to cut into slices. Serve with fresh berries or just as is.