To prepare a taillevents chocolate cake w pistachio sauce baked goods recipe, first you'll need to gather your ingredients. First, you will need the following ingredients: Chocolate cake flour, sugar, baking powder, cocoa, eggs, butter, vanilla extract, sour cream, salt, cinnamon, and nutmeg. Mix all of the ingredients together. Pour the batter into the greased and floured cake pan. Bake the cake in the preheated oven for 35 to 40 minutes, or until the toothpick comes out clean. Remove from the oven and let cool for 10 minutes before cutting into squares.