Combine first 5 ingredients in a medium bowl; stir well. Add oil; stir well. Firmly press mixture in bottom and up sides of a 9-inch deep-dish pie plate. Bake at 350° for 12 minutes. Cool completely.
Combine sour cream and next three ingredients; stir with a wire whisk until smooth.
Stir in chicken and next 5 ingredients.
Pour chicken mixture over prepared crust. Sprinkle a layer of grated parmesan cheese on top of chicken filling.
Arrange the pecan halves in radial lines on top of the parmesan-topped filling.
Bake at 350° F for 55 minutes or until set. Let stand 10 minutes before serving.
