Preheat the oven to 450°.
Roll out the dough to fit a 9-inch pie plate. Transfer the crust to the pie plate.
Trim the crust to ½ inch beyond the rim of the plate. Pinch of flute the edge.
Line unpricked crust with a double thickness of heavy duty foil. Fill with pie weights, dried beans or uncooked rice.
Bake 8 minutes. Remove the foil and weights and bake between 5 to 7 minutes longer or until light brown.
Cool on a wire rack. Reduce the oven setting to 375°.
In a large saucepan, combine cornstarch and the sugar. Stir in the milk until smooth.
Bring to a boil. Reduce the heat, cook and stir for about 3 minutes or until thickened and bubbly.
Remove from heat, and stir in the vanilla and butter. transfer to the crust, and sprinkle with cinnamon.
Bake for about 15 minutes or until golden brown. Cool the pie on a wire rack, and refrigerate until chilled.