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 pieplate. Bake at 350° for 12 minutes. Cool completely.
Combine sour cream and next 3 ingredients; stir with a wire whisk until smooth. Stir in chicken, 1/2 cup cheese, onion, and hot sauce. Pour chicken mixture over prepared crust. Arrange pecan halves over chicken mixture. Bake at 350° for 55 minutes or until set. Let stand 10 minutes before serving.