In a large square pan melts the butter. Most suitable is the original tray of the oven. Biscuits should be slightly loose, not ordinary, but something like biscuits breakfast for example. Arrange biscuits in melted butter tightly to each other to cover the tray. Scatter is the walnuts. Eggs, milk, baking powder, vanilla, sugar and flour cooked dough density as cake. Pour over biscuits to cover them completely. The plums are washed, dried, cut to half and released from the stones. Punched in the dough slightly lying, so as not to be seen dough. Bake at 180 C, upper and lower wire, one of the lower rails. If the oven has a fan, the temperature is about 20 C lower. Cut after it has cooled down. Serve available bit sweet cream and cake can be sprinkled with powdered sugar, especially if the plums are sour. Ripe plums give the best result, but other varieties of cookies are very tasty. If plums are still pretty solid, can be welded in fresh water for about 5 minutes, and then line up. Instead given above dough can use any favorite cake mixture. And for those who like, can put cinnamon in the dough.