For the smoothie bowl, wash grapes and strawberries thoroughly and pat dry. Peel banana and kiwi and blend both with grapes and water in a blender.
Add chia seeds and matcha powder and blend well again. Pour into a bowl and let it thicken a bit. Crush the strawberries with a blender stick or in a blender (or mash them with a fork) so that there are still small pieces.
Spread the crushed strawberries on the green mixture, sprinkle with cocoa nibs and decorate.