Line a medium baking sheet with a strip of parchment paper. Coat generously with nonstick cooking spray.
In a medium bowl, melt marshmallows in the microwave. Stir until smooth. Working quickly, dip strawberries into melted marshmallow and place onto prepared baking sheet. Place in your refrigerator to set marshmallow, about 10 minutes.
Meanwhile, melt chocolate in a separate bowl. Dip marshmallow-coated strawberries in chocolate, and set back onto the baking sheet. Sprinkle crushed graham crackers all over the chocolate layer.
Chill for at least 10 minutes to set, then serve. Store refrigerated.