Add mashed banana, Really Healthy Organic oats, chia seeds and toasted chopped almonds to an airtight container or mason jar.
Top with almond milk and stir well.
Close the lid and give it a good shake to ensure everything is well mixed.
Place in the refrigerator overnight or for at least 6 hours.
In the morning add additional almond milk to thin out (if desired) and top with additional sliced banana and chopped hazelnuts.