1. Preheat oven to broil. Line a baking sheet with Gefen Parchment and spray with cooking spray.
2. Spread out marshmallows on the baking sheet and broil until lightly browned — watch carefully, as it should only take a minute or two. Cool.
3. Mix marshmallows (they may have stuck together in chunks, that’s okay!) and sandwich cookies into the ice cream until the elements are lightly layered and mixed together, but not completely combined. Freeze completely.