Whisk together milk of choice, sweetener, and nut/ seed butter. You can also quickly combine all the ingredients by blending in a blender on medium to high speed for 30-60 seconds.
Pour liquid in a mason jar or other airtight container and add oats and chia seeds. Seal and shake the jar to combine.
Refrigerate overnight (or at least a four hours). Stir again just before serving and top with any desired toppings.
Notes
Nutrition information is calculated with almond butter, honey, and unsweetened almond milk. Nutrition profile will change with ingredient variations and toppings.