In a medium mixing bowl or mason jar, add rolled oats, milk, coffee, cocoa powder, sweetener, and chia seeds. Stir well until fully combined.

Cover the bowl or jar with a lid or plastic wrap and refrigerate for a minimum of 4 hours, preferably overnight.

In the morning, stir the oats. If too thick, add a splash of milk until desired consistency is achieved.

Serve the oats in a bowl or directly from the jar. Top with fruits, nuts, or a drizzle of sweetener.