Tomato Cobbler With Blue Cheese Biscuits

Name: Tomato Cobbler With Blue Cheese Biscuits
Ingredients: 2 cups all-purpose flour; 2 tablespoons baking powder; 1 tablespoon granulated sugar; 1/2 teaspoon salt; 1/2 teaspoon coarse ground black pepper; 3 tablespoon unsalted butter, cold and cut into cubes; 3 tablespoons vegetable shortening, cold and cut into cubes; 1/2 cup blue cheese crumbles; 3/4 cup cold buttermilk; 2 tablespoons olive oil; 1 tablespoon unsalted butter; 2 large onions, sliced; 2 tablespoons balsamic vinegar; 2 pounds cherry tomatoes; 1/4 cup coarsely chopped basil; 3 tablespoons all-purpose flour; 1/2 teaspoon red pepper flakes; salt and coarsely ground black pepper