1Place sheet of foil on lower oven rack to catch any drips. Heat oven to 400°F. In 10-inch skillet, mix chicken, chiles and enchilada sauce. Cook over medium-high heat 3 to 4 minutes, stirring occasionally, until hot and bubbly. Pour into ungreased 9-inch glass pie plate.
2In medium bowl, stir Bisquick mix, cornmeal, milk and egg until blended. Stir in corn. Spoon over chicken mixture.
3Place pie plate on rack above foil. Bake 22 to 27 minutes or until toothpick inserted in topping comes out clean. Top with cheese and tomato. Let stand 5 minutes before serving.