Preheat your oven to 350°F (175°C) and grease two 9-inch round cake pans. In a large mixing bowl, whisk together flour, sugar, cocoa powder, baking powder, and salt.

In a separate bowl, mix eggs, milk, vegetable oil, and vanilla extract. Gradually combine wet and dry ingredients until smooth.

Pour the prepared batter evenly into the two greased pans. Bake for 30-35 minutes. Allow to cool for about 10 minutes before transferring to wire racks.

Melt white chocolate in a microwave-safe bowl, heating in 30-second intervals until smooth. Add black food coloring if desired and stir well.

Once cakes are cool, place one layer on a serving plate, spread frosting on top, then place the second layer on top.

Drizzle the melted white chocolate over the top of the cake to create a spiderweb design. Use a knife or toothpick to form the pattern.

Decorate with chocolate shavings or plastic spiders. Admire your work and enjoy this spooky centerpiece!