In a mixing bowl, combine the rolled oats, chia seeds, ground cinnamon, and optional honey. Stir well to ensure that all the dry ingredients are evenly distributed.
Pour in the almond milk and add the vanilla extract. Stir gently until everything is well mixed, and you see no dry oats remaining.
Add the creamy peanut butter to the mixture. Use a spoon to swirl it in, making sure it combines thoroughly with the oat mixture.
Gently fold in the sliced banana, being careful not to mash them too much. You want those lovely banana slices to remain somewhat intact for texture.
Spoon the mixture into your jar or container. Make sure to leave a little space at the top, as the oats will expand as they soak.
Seal the container with a lid and place it in the fridge overnight. This allows the oats to absorb the liquid and flavors, creating a deliciously creamy texture by morning.
In the morning, give your oats a good stir. You can enjoy them cold or warm them up in the microwave for a few seconds. Top with additional banana slices, a drizzle of honey, or a sprinkle of cinnamon if desired.