Chocolate-y peanut-buttery goodness! These bar cookies will definitely satisfy your sweet tooth! I found this recipe in America's Test Kitchen's Family Baking Book. I wanted to make their Recipe #343983 but didn't have unsweetened chocolate on hand, so I decided to try something else for my chocolate-peanut butter fix. The Test Kitchen suggests letting the blondies cool for 2 hours before removing from the pan. Ha ha - as if anybody could wait that long! They are also most delicious when slightly warm. So I wait only 1 hour, just enough time for them to cool and firm up a bit before removing from the pan.