• 3/4 cup all purpose flour
• 3/4 cup quick-cooking oats
• 1/4 cup (packed) dark brown sugar
• 1/4 teaspoon (generous) ground cinnamon
• 1/8 teaspoon (generous) ground cardamom
• 6 tablespoons (3/4 stick) unsalted butter, melted, cooled slightly
• 2 pounds nectarines, halved, pitted, cut into 3/4-inch-thick slices (about 5 cups)
• 1 1/2-pint container fresh raspberries
• 2 tablespoons cornstarch