Microwave 1 of the chocolate squares in small microwaveable bowl on HIGH 1 min.; stir until chocolate is completely melted. Set aside.
Beat cream cheese, sugar and milk in large bowl with electric mixer on medium speed until well blended.
Add melted chocolate; mix well. Gently stir in whipped topping, marshmallows and peanuts.
Coarsely chop remaining 2 chocolate squares; stir into cream cheese mixture.
Spoon into crust.
Refrigerate 4 hours or until set. Store leftover pie in refrigerator.
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