Adapted from CD Kitchen
Place your crushed Butterfinger candy in the freezer while you prepare the custard.
Pour condensed milk and peanut butter in a large bowl and mix until smooth.
Add heavy cream, half & half and vanilla and blend until smooth.
Chill custard until cold or overnight.
Churn custard in an ice cream maker according to manufacturers instructions.
Add chopped Butterfinger candy at the end of the churning process and churn for an additional 5 minutes.
Transfer to a container adn store in freezer.