Add the rolled oats, chia seeds, maple syrup, and oat milk to a jar or container. Stir thoroughly until everything is evenly combined.

Cover and refrigerate overnight, or until the oats have softened and the mixture is thick and creamy.

When ready to serve, add the matcha powder, 1 teaspoon maple syrup, and chilled oat milk to a small bowl or cup. Use a milk frother, small blender, or whisk to mix until smooth and frothy. Add the remaining maple syrup if you prefer a sweeter matcha layer.

Give the chilled overnight oats a stir. If they have become too thick, add a small splash of oat milk until they reach your preferred consistency.

Spoon or pour the frothy matcha mixture over the oats.

Enjoy the layers as they are, or stir the matcha into the oats before eating.