Prepare your sugar cookie dough according to your recipe, adding the avocado coloring.

Preheat your oven and prepare your baking sheets.

Roll out the cookie dough and cut out the mummies using a gingerbread man cookie cutter. Place them on prepared baking sheets and press the legs together. Press two mini M'n'M's on each mummy for eyes. Bake cookies according to recipe instructions.

Cool cookies completely before frosting.

Using a #47 tip, pipe the white buttercream frosting using back and forth motions onto the mummies. Once the frosting is set up, store between layers of wax paper in an airtight container.