Roll pastry for 1-crust pie into 10" square. Cut several vents or prick with 4-tined fork for the escape of steam during baking.
Double the filling for a 9" fruit or berry pie. Place filling in 9" square pan. Adjust top crust, fold a little of the edge under and flute just inside edge of pan.
Bake in a hot oven (425°F.)40 to 50 minutes, or until lightly browned and the filling starts to bubble through the vents. Serve warm with cream, whipped cream, ice cream or a sauce.