To prepare the crust: Fit pie crust in a 9-inch deep dish pie plate. Fold edges under and crimp using the finger pinching technique. Line pastry with aluminum foil or parchment. Fill with dried beans or pie weights and bake at 425° for 5 minutes. Remove weights and foil; bake 2-3 more minutes or until golden. Cool.
To make the filling: In a medium size bowl whisk together sugar, cornmeal, flour, salt, melted butter, milk, white vinegar, and vanilla extract until fully blended. Add eggs, mix well. Pour into pie shell.
Place into a preheated 350°F oven baking for 50 to 55 minutes or until the center is set when gently shaken. Cover edges with aluminum foil after 20-30 minutes of baking to prevent over browning, if needed.
Cool completely on a wire rack then chill for at least 4 hours.
Slice and serve dusted with powdered sugar and a dollop of whipped cream.