Preheat your oven to 350°F (175°C) and line a cupcake pan with cupcake liners.
In a large mixing bowl, combine the chocolate cake mix, eggs, water, and vegetable oil. Mix well until smooth.
Divide the batter evenly among the prepared cupcake liners, filling each about 2/3 full.
Bake in the preheated oven for 18-20 minutes or until a toothpick inserted in the center comes out clean. Allow to cool completely on a wire rack.
Once cooled, use a piping bag or a knife to generously frost each cupcake with chocolate frosting, creating a smooth base.
With the white frosting, pipe a skeleton face on top of the chocolate frosting. Create a skull shape by piping a large circle for the head and smaller circles for the jaw and eyes.
Place a mini marshmallow for each eye socket and add a slice of black olive on top for the pupils.
For the mouth, use the black icing or the edible black marker to draw a spooky grin or jagged teeth.
Optionally, sprinkle some edible glitter for a spooky sparkle effect and finish by adding candy eyeballs on some cupcakes for extra fun.
Notes
Arrange the cupcakes on a spooky-themed platter or tray for a festive presentation.