To make dry blondies taste less dry you can do the following. First, you can use a bit of heat. Wrap them in a towel and microwave on medium heat for about 10 seconds. Secondly, you could top them with some delicious ice cream. This works very well in countering the dryness. Alternatively, you could top them with various liquid sweeteners (such as chocolate sauce, maple syrup) or whipped cream. Find more tips here.