I found the cutest cookie cutter at a local store called The Cake Carousel.
You could actually cut out a mask shape with a sharp knife, and a steady hand...or even use a template to follow the edge with your knife, but that wouldn't appease my need to spend, so I bought the above cute little cut-er.
I really wanted to go Batwoman on this project, but I couldn't stretch my words far enough to explain how Batwoman....ummm....likes to drive (?) through Mardi Gras parade routes, so....I stuck with Mardi Gras colors. I just used extra sprinkles and icing to decorate. It would be fun to have a group over to 'decorate' their own mask cookies. That's assuming one has friends, and more importantly, that one is willing to share their cookies, and at least one of those criteria does NOT apply to me.