Preheat oven to 375 degrees. Butter a 9 X 13 inch baking dish. In a large bowl, combine apples, blueberries (no need to defrost if using frozen), sugar, flour, cornstarch, vanilla, orange zest, juice and lemon juice. Transfer to baking dish and sprinkle with topping.
Topping- In a large bowl, combine cold butter, cut into small pieces, flour (spooned and leveled), oats, brown sugar, pecans, cinnamon, nutmeg and salt. Using an electric mixer beat on low until coarse crumbs form.
Bake until topping is browned and juices are thick and bubbling around edges, 55 to 60 minutes. Let cool 15 minutes before serving. |