Peanut Butter Frosting

I was supposed to make peanut butter truffle brownies for a graduation party tomorrow, but I was also making homemade oreos for the library bake sale. So instead of the brownies, I decided to double the recipe for the oreos and fill them with peanut butter frosting. Hopefully the grad won't be too disappointed...I know I wasn't!

Peanut Butter Frosting
1/2 cup peanut butter
1/4-1/3 cup butter, softened
1 tbsp milk(possibly more)
1/2 tsp vanilla
1 1/2 cups powdered sugar

Cream together butter and peanut butter. Add in 1 tbsp milk and vanilla. Slowly add in sugar. May need to add in more milk 1-2 tsp at a time until desired consistancy. Spread between 2 cookies or over cake/cupcakes.