In a mixing bowl, combine rolled oats, cocoa powder, and a pinch of salt.
Add the milk and stir until fully incorporated.
Mix in honey or maple syrup and vanilla extract.
Transfer the mixture into a jar or container with a lid.
Seal the container and refrigerate overnight (or at least 4 hours).
In the morning, give the oats a good stir to combine.
Add your choice of toppings, such as sliced bananas or chocolate shavings.
Enjoy your delicious chocolate overnight oats cold or at room temperature.
Store any leftovers in the fridge for up to 3 days.