Heat the grill to medium-high. Divide dough in half. Roll and stretch out each piece on a lightly-floured surface to make two 10-inch rounds. Brush tops with lightly with oil. Place dough rounds on grill, oiled-side down. Close cover and cook for 4-5 minutes until underside is golden brown. Pop any large dough bubbles that form on top with a knife or by pinching.Transfer rounds to a heat-proof work surface, grilled side up and let them cool for a couple of minutes. Turn the grill down to medium.
Frost the tops with chocolate spread and decorate with the toppings of your choice.
Using two spatulas, carefully return decorated pizzas to the grill. Close top and cook for 2-4 minutes, until pizzas are heated through and toppings are lightly toasted.