Preheat oven to 375 degrees. Oil a (9-inch) pie pan with cooking spray; set aside. In a large bowl, stir together berries, oats, pecans, baking powder, salt and apple. In a medium bowl, whisk together milk, yogurt, syrup, vanilla, egg and yolk; stir into oat mixture. Transfer to prepared pan and bake until firm and golden brown on top, about 50 minutes. Cut into slices and serve.