Baked Chicken Pecan

1 small onion , chopped 2 celery ribs , chopped 1 apple , peeled, cored and diced 3 tablespoons butter 1 teaspoon salt 1/2 teaspoon dried sage 1/8 teaspoon[...]

4 boneless skinless chicken breasts 1 1/2 tablespoons oil salt , to taste ground black pepper , to taste 1/4 teaspoon onion powder 1 cup pecans , finely[...]