Mix sugar, brown sugar, salt, corn syrup, butter, eggs, and vanilla together in a bowl.
Pour chopped pecans in the bottom of the unbaked pie shell.
Pour syrup mixture over the top. Cover top and crust lightly/gently with foil. Bake pie at 350º for 30 minutes. Remove foil, then continue baking for 20 minutes, being careful not to burn the crust or pecans.