I just made this recipe. Yum! It's not too sweet, which I really like. I, too, used frozen blueberries so I reduced the water to 1 cup. When I took the dumplings out of the oven, it looked really watery, so I was worried that it was too watery. But, when I dished up a dumpling and put some of the blueberry sauce on it, the dumpling soaked it up and it was perfect. I absolutely loved the taste of the dumplings! I plan to make it again!
This is great! Really easy and fast too! I used about peaches and blueberries about half and half. I I did substitute half the white flour for a whole grain blend that I happened to have and I added just a 1/4 cup sugar to the dumpling batter.