ingredients 6 peaches pitted and cut into 1/2-inch thick wedges 1 cup blueberries, picked over and rinsed 1 tablespoon cornstarch 2 tablespoons fresh lemon juice 1/3 cup granulated sugar 2/3 cup all-purpose flour 3/4 cup firmly packed light brown sugar 1/2 cup old-fashioned rolled oats 1/2 teaspoon salt 1 teaspoon cinnamon 6 tablespoons cold unsalted…