Place whipping cream into the bowl of an electric mixer. Beat on high for two minutes, or until stiff peaks form.
In a separate bowl combine sweetened condensed milk, vanilla extract, sugar, and peanut butter. Stir in peanut butter cups. Gently fold this mixture in with the whipping cream till combined.
Pour mixture into a large bread pan (at least 1.5 qt). Sprinkle with more peanut butter cup chunks, if desired. Cover with plastic wrap and freeze 8 hours or overnight. Serve and enjoy!