Place a pizza stone, unglazed ceramic tiles, or a heavy cookie sheet on the oven rack. Preheat oven to 400º F. If starting with pizza dough, pat or pull each piece into a 12-inch circle. Top each with some sauce, then scatter the chicken, basil, and mozzarella over each. Drizzle with olive oil. Sprinkle pizza stone with the cornmeal. Using the back of a cookie sheet, transfer the pizza to the oven. (You may have to bake the pizzas one at a time, depending on your oven size.) Bake 20 minutes or until the cheese is melted and the crust is browned.