In medium bowl, beat butter and sugar with electric mixer on medium speed until light and fluffy. Add eggs, one at a time, beating after each addition just until blended. Add melted chocolate; beat just until blended. On low speed, beat in flour and salt just until blended. Stir in vanilla and 1/2 cup each of the pecans and chocolate chips. Spread batter in pan. Sprinkle with remaining 1/4 cup each pecans and chocolate chips.