It’s super easy to make marshmallow cob webs or mummies.  Step 1. Microwave the marshmallows for about 30 seconds. Step 2. Use a fork to whisk them around in order to blend and deflate. Step 3. Use your fingers to pinch a bit of fluff then slowly pull your finger apart. Step 4. Wrap the marshmallow strings around the cookie or pastry you want to decorate. Step 5. Use thinner strands for cob webs and thicker strands for mummies.