1. Heat oven to 350°F.
2. Beat butter in medium bowl; add eggs and vanilla. Stir together sugar and flour; add to butter mixture. Stir in milk chocolate chips, peanut butter chips and nuts; pour into unbaked pie crust.
3. Bake 50 to 55 minutes or until golden brown. Cool about 1 hour on wire rack; serve warm with sweetened whipped cream or ice cream, if desired. Makes 8 servings.
To reheat: One slice at a time, microwave at HIGH (100%) 10 to 15 seconds.