In a medium saucepan, melt the peanut butter over medium heat.
Add the milk.
Add the cream.
Whisk in the sugar.
Add in the vanilla. Whisk the ice cream until the mixture comes together. Chill the mixture over night.
After the base has chilled, pour the mixture into your ice cream machine.
Meanwhile, melt your chocolate. I use the microwave, but you could use a double boiler as well.
Layer the ice cream with the chocolate. It is exactly the same as I did when I made Mint Chocolate Chip Ice Cream. The chocolate starts to harden as soon as it hits the cold ice cream, when you scoop it, you have chocolate shavings.
Let the ice cream harden for about 2 hours.