Creme Brulee Pie

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3 tablespoons cornstarch

1 2/3 cups heavy cream

1 (14-ounce) can sweetened condensed milk

3 egg yolks, beaten

1 tablespoons butter

1 tablespoon vanilla extract

1 (9-inch) pastry shell, baked and cooled

1/4 to 1/3 cup sugar

Sweetened whipped cream, to garnish