Add all of the ingredients for the overnight oats to a large jar. Note: if you're making a big batch of overnight oatmeal and you don't have a large enough jar, use a large mixing bowl to prepare the oats.
Secure the lid on the jar and shake well until everything is combined.
Refrigerate overnight (or at least 3 hours).
When ready to serve, stir well and taste for flavor. Add more pure maple syrup, and/or cinnamon to taste. Serve with your favorite toppings such as fresh fruit, nuts, and seeds.
Notes
If adding chia seeds or flax seeds, also add an additional ½ cup of liquid (water, or milk of choice).If you have a chai spice blend already, you can use 1 ½ teaspoons in this recipe rather than using all of the individual spices I call out.