Heat oven to 400°F. Spray 13x9-inch (3-quart) glass baking dish with cooking spray.
In 3-quart saucepan, heat cooking sauce, butter, potatoes and 1/2 teaspoon salt to boiling, stirring frequently. Remove from heat; stir in cheese. Pour hot potato mixture into baking dish.
Bake about 25 minutes or until bubbly around edges and hot in center.