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Preheat pizza stone for 10-15 minutes on medium high heat. You can test that the stone is ready by using a drop of water over the stone – the water should evaporate immediately.
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While the stone is heating, prepare the pizza dough as directed on the packaging and place on a pizza peel dusted with cornmeal (or flour).
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Spread the Nutella over the pizza dough leaving a ¼ - ½ inch border around the edge of the pizza dough. Sprinkle approximately ½ of the graham crackers over the Nutella followed by the marshmallows and chocolate chips.
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Decrease the heat on the grill to low (approximately 200-250F). Sprinkle the top of the pizza stone with cornmeal and transfer the pizza to the stone with a pizza peel. Close the lid on the grill.
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After 5 minutes, open the grill cover and rotate the pizza to allow for even cooking. Close the lid and cook for approximately 5-7 more minutes until the marshmallows and pizza crust are golden brown.
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Top immediately with remaining chocolate chips and graham crackers, and drizzle with chocolate sauce if desired.