Preheat oven to 350°. Let dough stand at room temperature 5-10 minutes to soften. With floured hands, press dough into an ungreased 13x9-in. baking pan. Bake 18-20 minutes or until lightly browned and edges are firm.
2.
Sprinkle with marshmallows; bake 2-3 minutes longer or until marshmallows are puffy.
3.
In a microwave, melt chocolate chips and shortening; stir until smooth. Sprinkle M&M's over marshmallows; drizzle with chocolate mixture. Refrigerate until set before cutting.
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