1. Preheat oven to broil. Place the pizza dough on a lined baking sheet or a pizza stone. Sprinkle evenly with marshmallow chunks, chocolate chips, and cookie crumbs. Place the “pizza” in the oven on a rack positioned in the center of the oven for about four minutes, or until marshmallows are a golden brown.
2. Meanwhile, in a double boiler, let the chocolate, whipped topping, and oil melt together, stirring occasionally to combine. When the pizza is done, drizzle the chocolate sauce over top and serve immediately.