Preheat oven to 350°F. Spray a 9” pie plate with nonstick cooking spray.
Press cookie dough into the pie plate. Bake for 22-26 minutes, until browned on the top.
Sprinkle with chocolate chips. Bake an additional 2 minutes. Carefully spread the chocolate chips smooth, then drop spoonfuls of marshmallow fluff on top. Bake another 1 minute, until fluff is melty. Swirl with an offset spatula or knife.
If using mini marshmallows: after spreading the melted chocolate chips, sprinkle the marshmallows on top and broil until the marshmallows are brown.
Serve while still warm. Best eaten with a fork straight from the pan! This also will last on the counter for a few days (when made with the marshmallow fluff) and is great room temperature.
