1. Preheat oven to 350 degrees F. Make cookies as directed on pouch (the smaller version). Cool cookies and cut into fourths.
2. Melt butter, peanut butter & brown sugar over med. heat until well blended. Refrigerate 30 min.
3. Fold 1 cup Cool Whip into peanut butter mixture. Save remaining Cool Whip.
4. Place half of the cookie pieces in bottom of 2-quart glass bowl. Spoon half of peanut butter mixture over cookies, spread 1/2 remaining Cool Whip over mixture. Top with remaining cookies and peanut butter mixture and the rest of Cool Whip. Sprinkle with peanuts. Keep refrigerated.