
Nonstick cooking spray
½ cup peach nectar
1⁄3 cup granulated sugar
2 tablespoons cornstarch
2 tablespoons lemon juice
2 16-ounce bags frozen sliced peaches
1 cup fresh blueberries
¾ cup old-fashioned rolled oats
½ cup spelt flour
1⁄3 cup packed brown sugar
½ teaspoon ground cinnamon
¼ teaspoon salt
6 tablespoons unsalted butter, chilled