Preheat oven to 350 degrees and line a 9 x 13 pan with foil.
With floured hands, press prepared cookie dough into a 9 x 13 baking dish. Bake at 350 degrees for 16-19 minutes until golden and edges are firm.
Sprinkle with Marshmallows and return to the oven for 2-3 minutes until marshmallows are puffy.
Immediately sprinkle with holiday M M’s and allow to cool.
Once cool, microwave chocolate chips with shortening for 20 second intervals, stirring after each one, until chocolate is melted and smooth. Drizzle melted chocolate over cooled bars.
Refrigerate until chocolate is set. Remove from pan using foil and cut into bars. Makes 2 dozen bars.
About 1 lb. of refrigerated cookie dough could be substituted for the prepared mix. Just bake 18-20 minutes.
2 dozen bars