With an electric mixer combine the peanut butter and sugar until smooth. Add in the milk and mix slowly until the sugar is incorporated – at least two minutes. Mix in the heavy cream and vanilla and stir until both items are incorporated and smooth.
Making the ice-cream:
*make sure you freeze your ice cream base itself overnight before making any ice cream
With the ice-cream machine running, slowly pour the mixture into the bowl. Let it run for 20-25 minutes or until thick. A few minutes before you turn the machine off, dump in the chopped peanut butter cup pieces.
Transfer to freezer safe container and allow to chill.