This quick and easy crisp comes together in no time. A spoonful of whipped cream or ice cream on top wouldn't hurt.
Preheat oven to 375 degrees. Butter a 9-by-13-inch baking dish.
In a large bowl, combine apples, cranberries, sugar, flour, vanilla, and orange zest and juice. Transfer to baking dish and sprinkle with topping.
Bake until topping is browned and juices are thick and bubbling around edges, 55 to 60 minutes. Let cool 15 minutes before serving.
Fresh or frozen cranberries work well here (no need to defrost the frozen ones before using). You can add 1/3 cup chopped walnuts to the topping, if you like.