Fall Chicken Salad with Apples, Cranberries & Pecans



2 boneless, skinless chicken breasts
1 tablespoon olive oil
1 teaspoon salt
1 teaspoon pepper
1 Granny Smith apple, skin left on, chopped, about 1-1/2 cup
½ cup dried cranberries
½ cup chopped unsalted roasted pecans
2 stalks of celery, chopped, about ½ cup
¾ cup mayonnaise (or sub greek yogurt)
whole wheat bread