Preheat oven to 375ºF. Melt the butter in the pan (8*8)

In a bowl, stir together Bisquick®, cream, water, sugar, and cinnamon. Once the batter is ready, blend in the blackberries, gently folding them in. Pour the batter over the butter

Bake at 375ºF for 15 minutes, then turn down and bake at 325ºF for another 30 minutes or until done