Blueberry Cobbler with fruit

1 1/3 cups all-purpose flour (unbleached) 3 tablespoons sugar (divided) 1 1/2 teaspoons baking powder 1/2 teaspoon salt 5 tablespoons vegan margarine (melted)[...]

2 (12 ounce) packages frozen blueberries , thawed 1/3 cup granulated sugar 4 tablespoons granulated sugar , divided 2 tablespoons all-purpose flour 1 1/2 cups[...]

1 tablespoon unsalted butter , at room temperature, for dish 1 Preheat oven to 375°. 2 Butter a 2-quart baking dish. 3 To make filling--rub the sugar,[...]