place the butter and peanut butter into a medium bowl. and beat with an electric mixer. gradually mix in the sugar, and when it starts to get thick, incorporate the milk 1 tablespoon at a time until the sugar is mixed in and the frosting is thick and spreadable. beat for at least 3 minutes for it to get good and fluffy.
next put the frosting into a piping bag or a zip lock bag and snip off the end of it. pipe small mounds of frosting onto a baking sheet lined with wax paper or parchment paper. and put them into the freezer till hard enough to work with.
melt the chocolate while the frosting is in the freezer and when the frosting is ready take out and working quickly dip into the chocolate and covering the mound then return to pan and when all are covered with chocolate place in the freezer until chocolate is set. Then enjoy or place in covered container and refrigerate.