Preparation

• Heat  oven to 375°F.
• Chop  2 chocolate bars; set aside. Break remaining chocolate bars into small pieces; place in small microwaveable bowl. Microwave on HIGH 1 min. or until chocolate is almost melted; stir until completely melted.
• Combine  flour, baking powder and salt. Beat butter and sugar in large bowl with mixer until light and fluffy. Add eggs, vanilla and melted chocolate; mix well. Gradually beat in flour mixture until well blended. Stir in nuts and chopped chocolate.
• Drop  rounded tablespoonfuls of dough, 2 inches apart, onto baking sheets sprayed with cooking spray.
• Bake  12 to 13 min. or edges are set. Cool on baking sheets 2 min. Remove to wire racks; cool completely.