To prepare a white chocolate layer cake with raspberry filling recipe, first you need to prepare the cake batter. First, you will need the following ingredients: White chocolate cake mix, sugar, eggs, vanilla extract, buttermilk, flour, baking powder, salt, and nutmeg. You will also need butter and vanilla. If you don't have butter, use shortening. Mix the dry ingredients together. Add the wet ingredients and mix until just combined. Pour the batter into the prepared cake pan and bake for 35 to 40 minutes or until toothpick inserted in the center comes out clean. Allow cake to cool for 10 minutes before removing it from the pan.