soup mixture in a 13 x 9-inch baking dish coated with cooking spray. arrange 6 tortillas over the soup mixture, and top with 1 cup chicken mixture and light, even layer of cheese edge to edge. repeat layers, with thicker layer of cheese on this layer. repeat, ending with approximately 3 layers of meat, 4 layers of cheese. bake at 350° for 30 minutes or until bubbly. 