Heat oven to 350 degrees F (175 degrees C). Grease bottom of one13x9 inch pan.
In a small bowl blend the cream cheese, peanut butter, white sugar and 1 egg. Beat at medium speed until smooth. Stir in peanuts and set aside.
In a large bowl combine the brownie mix, water, oil and 2 eggs. Beat for fifty strokes with a wooden spoon.
Spread half of the batter into the prepared pan. Drop filling by tablespoonfuls over brownie batter. Spoon remaining batter over filling. Pull a knife through the batter in wide curves, turn pan and repeat for a marbled effect.
Bake at 350 degrees F (175 degrees C) for 30 minutes. Cool completely and cut into bars. Sore tightly covered in the refrigerator.
