Prepare cupcakes according to package directions using chocolate cake mix. Cool completely.

Use a small knife or cupcake corer to cut out the center of each cupcake. Fill with red jam and replace the top piece.

In a large bowl, beat butter until creamy. Gradually add powdered sugar, milk, and vanilla until frosting is fluffy.

Tint frosting with green food coloring (add a touch of black for a spooky green).

Frost cooled cupcakes with green frosting. Dip edges into chocolate cookie crumbs to create a 'dirt' effect.

Decorate with candy zombie hands, candy eyes, or gummy body parts sticking out of the frosting.

Optional: drizzle extra red jam on top for a gory effect!