DELICIOUS! My 4 year helped so much! We used whole wheat pastry flour. Not sure if the "tip" to keep the blueberry from sinking helped. Next time, I will lay some of the batter without blueberry at the bottom. Then lay some with blueberries in it in the middle and add a few right to the top. Also we used liners and because the berries (we also used raspberries) sunk to the bottom, the stuck to the paper.
