1. In a medium skillet, cook berries, lemon juice, 4 tablespoons sugar and 1/4 cup water over medium heat until slightly thickened, about 11 to 13 minutes.
2. Meanwhile, in a bowl, whisk together flour, baking powder, baking soda, salt and 2 tablespoons sugar; add melted butter and buttermilk. Stir until a moist dough forms. Dividing evenly, spoon 6 dollops of dough over fruit. Combine cinnamon and 1 tsp. sugar and sprinkle over dough.
3. Cover pan tightly with foil and cook over medium-low heat until dumplings are set and tops are dry to the touch, about 15 minutes. Serve warm.