In a mason jar or a small bowl with a secure lid, combine almond milk, chia seeds, peanut butter, and maple syrup. Stir well. It's okay if the peanut butter isn't fully blended; this creates delightful peanut butter swirls for the next day.
Incorporate the rolled oats into the mixture, ensuring they are fully immersed in the almond milk.
Seal the container with its lid and refrigerate for a minimum of 6 hours, preferably overnight, allowing the oats to soak and flavors to meld.
The following morning, the oats can be enjoyed cold, straight from the fridge. If desired, enhance with your choice of toppings.
For a warm treat, microwave the oats for 45-60 seconds. Ensure the jar has enough space to prevent overflow. Alternatively, pour the oats into a saucepan and warm over medium heat, adding extra liquid if needed.