|1. Heat oven to 400°F.|
2. Cook beef in a 10-inch skillet over medium heat for 8 to 10 minutes, stirring occasionally, until brown, then drain. Stir together potatoes, sauce mix, boiling water and milk in ungreased 2-quart casserole, then stir in beef and 1/2 cup of the cheese.
3. Bake uncovered for about 30 minutes or until top is light golden brown. Sprinkle chips over casserole and sprinkle remaining cheese over chips. Bake for an additional 3 to 5 minutes or until cheese is melted. Let sit for 2 minutes before serving.