Does anyone have a recipe for Peanutbutter buttercream?

No, but I've been thinking of doing this too. I make hazelnut BC, which is basically the same thing. I either use hazelnut praline, or I toast the hazelnuts in the oven then run them in the food processor until they form a paste. Then I beat it into the BC, starting with about 10% by weight and adding more to taste. I'm sure the same method would work with peanuts. Good luck and let me know how it works!

i have a recipe that i use from the cake doctor book, but i can't find my book at the moment. i did find a recipe that is somewhat close to it.

http://www.bakedecoratecelebrate.com/recipes/peanutbutterbuttercreamicing.cfm

Oh thank you so much I think I will try that recipe.