Heat oven to 425°F.
Combine all filling ingredients except cheese in 12-inch skillet. Cook over medium-high heat, stirring occasionally, 10-14 minutes or until mixture comes to a boil.
Combine milk, eggs and butter in bowl; beat at medium speed 1 minute.
Add flour and salt; continue beating until smooth.
Pour hot chicken mixture into ungreased 13×9-inch (3-quart) baking dish. Top with cheese.
Pour topping mixture carefully over cheese.
Bake 25-30 minutes or until puffed and lightly browned. Serve immediately.