Preheat oven to 350°F. Grease 8 or 9-inch square baking pan. Melt 1 cup chocolate chips in small heavy saucepan over low heat. When chips begin to melt, remove from heat; stir. Return to heat for a few seconds at a time, stirring until smooth. Let cool 5 minutes.

Combine in large bowl, melted chocolate, cookie mix, eggs and vanilla. Beat until well blended. Stir in 1/2 cup nuts. Spread evenly into prepared baking pan. Bake for about 20 minutes. Do not overbake. Cool slightly. Meanwhile, in saucepan, melt remaining chocolate. Cool 5 minutes. Spread over baked brownies. Press remaining nuts into top. Cut into squares. Makes 16 brownies.