Stir the milk, yogurt, vanilla, and maple syrup together in a small container like a mason jar or Tupperware.
Add the oats, chia seeds, and protein powder. Stir until well combined and protein powder is dissolved.
Cover container with a lid and place in the refrigerator overnight (or at least 4 hours).
Before eating, stir the mixture. If needed, add a splash of milk to loosen it up. Then, add your favorite toppings and enjoy! See Notes section below for flavor variations.
