Preheat your oven according to the cupcake mix instructions.

Prepare both chocolate and vanilla cupcake batters separately as per the package instructions.

Fill your Halloween-themed cupcake liners about two-thirds full with batter and bake them in the preheated oven.

Once baked, remove the cupcakes from the oven and let them cool completely on a wire rack.

While the cupcakes are cooling, prepare your buttercream frosting. Divide it into two bowls and color one with green food coloring and the other with purple food coloring.

Using a piping bag, frost the cooled cupcakes with green and purple buttercream. Get creative with swirls and peaks!

Decorate your cupcakes with edible eyes and black fondant shapes (like bats and spiders).

Finish off by adding gummy worms and spooky sprinkles for that extra creepy effect.