1.Heat Oven To 450 Degrees F. 2.Combine Potatoes, Onions, Garlic Powder And 1 Cup Cheese. 3.Place Crust On Baking Sheet; Spread With Potato Mixture To Within 1/2 Inch Of Edge. Fold Over Edge Of Pastry To Partially Cover Potato Mixture. 4.Bake 20 To 25 Min. Or Until Crust Is Golden Brown. Sprinkle With Chives.