Yum. Takes about days to completely make from scratch. Used cold brew to make less bitter and more sweet, consider adding mocha crumbles/hot brew coffee next time to cut the sweetness. Most of time spent waiting for things to chill/brew.
2 ½ cups sifted cake flour 1 tsp baking soda ½ tsp salt 4 ounces white chocolate, finely chopped ½ cup boiling water 1 cup sticks) butter, softened 2 cups sugar 4 eggs, separated 1 tsp vanilla extract 1 cup buttermilk