Blackberry Cobbler

INGREDIENTS:

1 1/2 cup all-purpose flour

1 3/4 cups white sugar, divided

1 1/2 teaspoon baking powder

1/2 tsp cinnamon, divided

3/4 teaspoon salt

9 tablespoons cold butter

1/4 + 2 Tb cup boiling water

2 tablespoons cornstarch

1/4 cup cold water

1 tablespoon lemon juice

4 cups fresh blackberries, rinsed and drained

DIRECTIONS: