1) Heat oven to 350 degrees.
2) Lightly Spray 9x13 in pan with baking spray with flour (do not use dark or nonstick pan).
3) In large bowl, mix cake mix, butter, milk and 1 egg with spoon until dough forms.
4) Spoon into pan, press evenly in pan.
5) Sprinkle dough with peanut butter chips and peanuts.
6) In another large bowl, beat cream cheese, peanut butter, vanilla, and 3 eggs with a mixer on medium speed until smooth.
7) Beat in powdered sugar on low speed.
8) Pour mixture over chocolate mixture in pan, spread evenly.
9) Bake 45-50 minutes or until topping is set and deep golden brown.
10) Cool at least 30 minutes to serve warm or cool completely.
11) When cutting serving pieces wipe knife with paper towel after cutting each row.
12) Top each piece with hot fudge topping and chopped peanuts if desired.
13) Store covered in refrigerator .
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