Melt butter in skillet over medium heat. Pour in blueberries, 3/4 cup sugar and water. Cook until a light syrup forms, about 5-8 minutes.
As blueberries are cooking, mix together flour and 1 tablespoon sugar. Cut in butter with a fork, pastry blender or with fingers just until crumbly. Stir in buttermilk just until combined. Dough will be very wet and sticky.
Stir blueberries and then drop dough by large 1/4 cup scoops into the skillet.
Place skillet in oven and bake until breading has cooked through and browned on top, about 15 minutes. Blueberry syrup should have also thickened.
Remove from oven and allow to cool slightly. Serve while warm.