Heat oven to 375°F. Separate dough into 5 biscuits; press each into 5 1/2-inch round. Coat both sides of each with cornmeal; place on ungreased cookie sheet. If biscuit loses shape, press out again.
Bake 10 to 12 minutes or until bottoms are golden brown. Sprinkle cheese over biscuits; bake about 2 minutes longer or until cheese is melted. Meanwhile, heat chicken as directed on container.
Top each biscuit with warm chicken, lettuce and sour cream. Fold each in half.