"I doubled the recipe for the delicious fudgy brownie recipe on my site but you could really use any brownie recipe you love for the base. I didn't add any extra sweetness to the peanut butter and I really liked the contrast of sweet brownies and not-too-sweet peanut butter; however, if you think you'd like less contrast, add about 1 tablespoon of powdered sugar to the peanut butter after melting...."