Preheat oven to 350°F. Put the pie dough in a 9-inch pie plate and set aside.
Whisk sugar, corn syrup, butter, and vanilla in a saucepan and bring to a boil, stirring constantly. Once boiling, reduce the heat and simmer uncovered for 6 minutes, stirring constantly. (Do not overcook).
Remove from heat and cool to room temperature. Then, mix in eggs until well blended.
Place chopped pecans in the unbaked pie shell, and pour the pecan pie filling over the chopped pecans. Arrange the pecan halves, flat side down, on top of the filling.
Bake until the center no longer jiggles, about 1 hour.
Applying a crust shield, or aluminum foil, over the exposed pie crust will help keep it from burning. Do not cover the center of the pie.