Stir the banana, oats, coconut milk, soy or almond milk, chia seeds, matcha powder and salt together in a small container. Cover and refrigerate overnight.
Stir, transfer the oats to a bowl if desired, and top with berries.
Using light coconut milk gives these oats a nice richness and flavor, but if you don't have any on hand, you can substitute additional soy or almond milk.Feel free to substitute your favorite fruit, or whatever happens to be in season when you make this. Peaches, mangoes, and other types of berries would all be delicious.If you're new to matcha, start with half the amount called for, taste test before serving, and add a bit more to your liking.