I've seen tons of recipes out there for "Butterfinger Truffles" where all they did was crush the candy bar and mix it with chocolate ganache... I didn't feel like this would cut it, so I found how to make the candy myself.
I love it... it tastes like Butterfinger, and surprisingly it feels like you are eating a Butterfinger!
1 cup granulated sugar
2/3 cup light corn syrup
1/3 cup salted butter
2 1/2 cups confectioners' sugar
1/3 cup powdered milk
1 teaspoon vanilla
2 cups creamy peanut butter
In a medium sized bowl, combine the sifted confectioners' sugar and powdered milk. Set to the side.
In a medium saucepan, combine the granulated sugar, corn syrup and butter. Bring to a boil on high heat, stirring constantly. Once it reaches the boiling point, reduce heat to medium and continue stirring for about 5 minutes, stirring occasionally. Stir in the vanilla extract and remove from heat.
Add the confectioners' sugar and powdered milk mixture to the wet ingredients.
Pour mixture into a large microwave safe bowl and mix with peanut butter. Microwave in 15 second intervals until it is smooth but grainy. (My sugar mixture clumped up, so I had to actually blend the mixture until it was right.)
Fill your candy molds or roll by hand into balls and coat those if you don't have candy molds.
I have posted some tips on filling candy molds on my blog: http://papercookies.blogspot.com/2011/12/creamy-caramel-filled-chocolates.html