Preheat oven to 375 degrees. Toss the fruit mixture together into a greased cooking pan until evenly combined.
Add the topping ingredients in a mixing bowl, cutting the butter into the dry ingredients until you get a coarse crumble. Spread the topping over the top of the fruit mixture and bake for 30_40 minutes or until browned and crispy. Cool slightly before serving. Serve with vanilla ice cream if desired.