Bake your favorite cookies according to directions, or use store bought. (let cool)
Use food coloring to tint frosting to desired colors.
Spread frosting on the top of 1 cookie. Press a second cookie, flat side down, on frosting at an angle. Cookies should touch on one side and about 1/2 inch apart on the other, to look like open mouth. Press three mini marshmallows in the frosting for the teeth.
Add additional frosting to the top to attach eyes.
Halloween Monster Cookies https://www.mommysfabulousfinds.com/halloween-monster-cookies-recipe/