Pour all the ingredients into a quart-size mason jar (except the "Optional Serving Suggestions"), starting with the rolled oats and ending with the vanilla extract. Stir until well combined. Refrigerate the oats overnight. The oats may be kept in the fridge for 2-3 days.
To enjoy, spoon the oats (as much as desired) into a bowl or smaller to-go container. Add any optional serving suggestions to the top of the oats. I personally like to top my oats with a nut butter, banana or berries, and hemp seeds.