Preheat oven to 325 degrees. Pam spray a 9 x 13 inch pan. In a large bowl, mix thawed whipped topping, eggs and vanilla until smooth. Stir in brownie mix just until moistened. Stir in nuts, spread mixture into pan. Sprinkle chocolate chips on top. Bake for 30-40 minutes, or until toothpick comes out clean. Do not overbake.
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