Line 8 or 9-inch square pan with foil, extending foil over edges. Place chips in medium microwave-safe bowl. Microwave on HIGH for 1 to 2 minutes or until melted, stirring every 15 seconds until smooth.
Reserve 1/4 cup nuts for garnish. Add remaining nuts and all remaining ingredients to melted chip mixture; mix well. Spread in foil-lined pan. Sprinkle with reserved nuts. Refrigerate 1 hour or until firm.
Remove fudge from pan by lifting foil. Remove foil; cut into squares.