Melt chocolate bars in microwave in 30 second increments, stirring after each increment.
Cover a baking sheet with aluminum foil. Pour melted chocolate on foil and use back of spoon to spread very thinly.
Sprinkle mini marshmallows and Golden Grahams over chocolate. Press gently to set.
Refrigerator bark for 30 minutes, or until chocolate is set and hard.
Break bark into pieces and serve.