Combine the rolled oats, cocoa powder, cinnamon, chia seeds, vanilla extract, milk, chopped banana, and honey in a jar or container with a lid.
Stir everything together until well combined.
Secure the lid on the jar and refrigerate for at least 4 hours, or ideally overnight.
In the morning, stir your oats well. If the mixture seems too thick, add more milk to reach your desired consistency.
Top with sliced bananas, chocolate chips, or your favorite toppings, and enjoy!
