Melt the butter, sugar and chocolate in a hot water bath.
Beat the egg whites into very firm snow.
Mix the egg yolk and the flour, pudding powder, cinnamon and the almonds together (it will crumbly), add the hot chocolate while stirring, stir in the egg whites, finally fold in the apples cut into very small cubes with a spoon.
Fill the dough into a well-greased and floured or sprinkled with breadcrumbs Gugelhupf tin and bake in a preheated oven at 160 ° for about 40-45 minutes (test with chopsticks).