In a large mixing bowl, add 1 cup of rolled oats, 2 tablespoons of cocoa powder, and any optional chia seeds. Stir the dry ingredients together until well blended.

Pour in 1 cup of freshly brewed coffee into the dry mixture. Use a whisk or fork to incorporate the coffee gradually.

Next, add 1 cup of milk to the mixture. Mix until all ingredients are combined. If using Greek yogurt, fold in 0.5 cup at this stage.

Drizzle in your preferred sweetener, stirring to ensure even distribution.

Divide the mixture into jars, filling them about three-quarters full. Seal each container tightly.

Place the sealed jars in the refrigerator for at least 4 hours or overnight.

In the morning, stir the oats and enjoy chilled or warmed in the microwave.