I softened the butter, left the milk out at room temperature and added powdered sugar 1/2 cup at a time, then added a bit of milk to get a good consistency. However, I didn't feel that there was enough peanut butter flavor, so I added probably about 1/2 cup more total, along with extra milk. This was VERY light and fluffy, and more than adequate for a 2-layer 8 inch cake. Also, delicious and not too heavy. I will be making this again!
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