Heat oven to 350. Spray a lg rimmed baking sheet w/ cooking spray. In lg shallow dish or bowl, combine buttermilk and egg. In another shallow dish, combine 1 cup pecans, bread crumbs, paprika, salt and pepper.
Place flour in another shallow dish. Dredge each chicken breast in flour, dip in buttermilk mix, then roll in pecans to coat evenly.
Place chicken on baking sheet. Drizzle w/ melted butter. Sprinkle w/ remaining ecans. Bake, uncovered about 20 mins, or until juices run clear.