Preheat oven to 375°
Lightly grease baking dish.
In a bowl, toss berries with sugar, flour, zest, and salt.
Pour berries into baking dish.
In another bowl, whisk together egg, buttermilk, butter, and vanilla.
In a third bowl (or the original one), mix together flour, sugar, baking powder, cinnamon, and salt.
Pour wet ingredients into the dry ingredients and gently fold to form a soft dough.
Drop heaps of dough onto fruit, spacing evenly. (Dough will not completely cover the fruit).
Bake until fruit is bubbling and the topping is browned. (about 45 minutes)