In a large bowl, combine the oats, chia seeds, and cocoa powder. Set aside.

In a medium bowl, whisk together milk, peanut butter, maple syrup, and vanilla extract until smooth.

Pour the wet mixture into the dry ingredients and stir well to combine.

Transfer the mixture into a jar or container, cover, and refrigerate overnight.

In the morning, stir the oats and add extra milk if needed for desired consistency. Top with additional peanut butter and serve.