Combine rolled oats, cocoa powder, and a pinch of salt in a mixing bowl.

Whisk together cooled brewed coffee, milk, maple syrup, and vanilla extract in a separate bowl until well blended.

Pour the wet mixture over the dry ingredients and stir gently until oats are coated.

Cover the bowl tightly or transfer to an airtight container; refrigerate overnight or for at least 4-5 hours.

In the morning, stir the mixture, adjust consistency with coffee or milk if needed, and add toppings before serving.