For the Baking Dish - Brush softened or melted butter on the bottom and sides inside of the baking dish.
For the Filling - To the baking dish, add the fruit mixture. Spread the fruit out evenly in the dish.
For the Topping - Spoon the batter evenly on top of the fruit. Try to spread the batter evenly on top of the fruit rather than putting too much in one spot. If the topping is spread too thick, when baking in the oven it may brown too much on the top before the under crust is fully cooked.
Sprinkle sanding sugar (or other type of large crystal sugar) evenly on top of the batter.
Baking the Cobbler - Just in case the cobbler bubbles over the edge of the baking dish while in the oven, set the dish on top of a cookie or sheet pan.
Bake in a preheated oven until the crust is golden brown on top and the filling is bubbling (about 50 to 53 minutes).
Serve while the cobbler is warm and top with vanilla ice cream.