To get it really ice-creamy first peel and put the banana into the freezer for two hours.
To make the acai bowl add frozen banana, berries, acai puree, rolled oats, soy milk and maple syrup into the blender and blend until smooth. If you use a frozen pack of acai puree make sure you break it in a couple of places before you throw it into a blender (put it under a hot tap water for a couple of seconds before breaking). If you go the powder + ice cube route be sure your blender can handle it!