Grease a 9x9-inch baking dish. Set aside.
Peel, core, pit, and/or stem the fruit as necessary, and cut into bite-sized pieces.
Toss fruit with remaining filling ingredients in large bowl. Pour the filling mixture into the prepared baking dish.
Preheat oven to 375°F.
While the oven is preheating, prepare the crumble topping. Whisk together all the dry ingredients for the topping in a large bowl.
Using a pastry blender or your fingers, cut or work the butter or margarine into the dry ingredients until large crumbs form.
Scatter the crumble topping over the fruit mixture, in an even layer.
Bake until top is firm and the filling bubbles up through the topping at the edges of the baking dish.
Cool at least 15 minutes before serving.