In a medium mixing bowl or a mason jar, combine rolled oats, cocoa powder, and chia seeds. Stir together until evenly distributed.

Pour in preferred milk, followed by maple syrup and vanilla extract. Stir until all ingredients are blended.

Fold in Greek yogurt until well combined, enhancing the texture.

Sprinkle chocolate chips over the mixture and gently fold them in.

Cover tightly and refrigerate for at least 6 hours, preferably overnight.

In the morning, stir and serve cold, adding toppings if desired.