Preheat your oven to 350°F (175°C).

In a large bowl, whisk together the flour, sugar, cocoa powder, baking powder, baking soda, and salt.

In another bowl, combine the eggs, buttermilk, vegetable oil, vanilla, vinegar, and black food coloring. Mix until well blended.

Gradually pour the wet ingredients into the dry ingredients and mix until just combined.

Divide the batter evenly among greased cake pans.

Bake for about 30-35 minutes, or until a toothpick inserted into the center comes out clean.

Once done, allow the cakes to cool in the pans for about 15 minutes before transferring them to wire racks.

In a mixing bowl, beat together the butter and cream cheese until creamy.

Gradually add powdered sugar and vanilla extract, mixing until smooth and fluffy.

Level your cooling cakes if needed, and place one layer on a serving platter. Spread frosting on top, add the second layer, and cover the entire cake with frosting.

Decorate with black sprinkles or edible eyes for a spooky effect.