This was so delicious and a big hit with everybody! I was a little nervous because the preparation was not exactly fool-proof. When the directions stated to cut in butter until "crumbly", I felt that was too vague. I cut in the butter until it was the size of peas, When I added the sour cream mixture, the dough was really sticky and hard to spread in the pan. I really needed to keep flouring my hands to work with it and press it evenly into the pan. I did not sprinkle 1/3 cup sugar on top, but more like 3 tablespoons, because I didn't want it to be too sweet. Needless to say, I was worried that I hadn't done everything correctly, so I was quite pleased when I removed this from the oven and it was wonderful! It was perfectly sweet and delicious both warm and cold. I will definitely try this again. Thanks for sharing. Made for Spring PAC 2012.