Make a boxed cake as directed on the box and allow the cake to cool completely. Once the cake has cooled, cut it into small pieces and place them in a large mixing bowl. Break up the pieces by hand or with a spoon to get small crumbles.
Take the container of frosting and mix it into the crumble mixture. This takes a little elbow grease to get it all mixed in. The mixture will be similar to dough.
Open each of the cookies and remove the cream filling. Break each chocolate round in half. Don't worry about being perfect, they will look more realistic with broken edges and varying sizes. If desired, mix the cream from the cookies into the cake mixture.
Prepare a cookie sheet with wax paper. Scoop out 1 tablespoon of cake mixture and roll it into a ball between your hands (this is easier if you spray your hands with non-stick spray). Place each ball on the wax paper and continue to make balls with the rest of the mixture.
Melt the chocolate candy coating in a microwave-safe bowl for 45 seconds. Stir the coating and continue to melt at 20-second intervals until fully melted. You can also use a double boiler on the stove. If desired, add a few drops of black food coloring to darken the chocolate.
Using a long-handled spoon or dipping stick, dip each ball into the melted chocolate and coat it completely. Tap off the excess coating and place the ball back on the wax paper. Immediately place a broken cookie wing on either side of the ball and place 2 eyeballs on top. Repeat with all of the balls. If your candy coating starts to thicken, place it back in the microwave for 20 seconds to soften it again.
Allow the bats to set completely before enjoying them (you can speed up the process in the fridge).