Preheat oven to 350°F and prepare baking pan with nonstick spray or butter and parchment.
Add cake flour, baking soda, baking powder and salt to a bowl and stir until combined. In another small bowl stir cocoa powder with the boiling water and mix together. Add black gel coloring and set aside to cool.
In a mixer add butter, vanilla and sugar and cream together. Add eggs one at a time, fully mixing in after each one.
Add ½ of the dry mixture to butter mixture and combine then add ½ of the sour cream and combine. Repeat until all ingredients are added and mixed in. Then, add cocoa and mix until fully incorporated.
Add batter to the prepared baking dish and bake for 30 minutes or until a toothpick is clean. After the cake has fully cooled, remove from baking pan and cut out bats using a cookie cutter.