1. In a jar or container, combine the certified gluten-free oats, chia seeds, and ground flaxseeds. If using, add psyllium husk powder and cinnamon.
2. Pour in the plant-based milk. Add the fresh or frozen berries and nut butter (or seed spread).
3. If desired, stir in a natural sweetener (like maple syrup or stevia) and/or a scoop of protein powder.
4. Stir all ingredients thoroughly to ensure even distribution and that no dry clumps remain.
5. Cover the container tightly and place it in the refrigerator for at least four hours, or preferably overnight, for optimal texture.
6. In the morning, give the oats a quick stir. If too thick, add a splash more milk. Enjoy your nutritious and fiber-rich breakfast!