Using the white decorating icing, "glue" a Twix bar to the top of each brownie with the icing.
Next, using the white decorating icing, "glue" the candy eyeballs toward the top of the Twix bar.
Zig-zag white icing across the top of the Twix bar, doing your best not to cover up the eyes.
That's it! Your spooky mummy treats are ready to serve.
Video
Notes
*If you don't want to buy icing, you can also make homemade cookie icing; then use a pastry bag and round tip to decorate. If you're using homemade icing and you don't have pastry bags or tips, you can use a sandwich bag instead. Just snip the corner of a sandwich bag, fill the bag with icing, and swirl away.