Before opening can of coconut milk, shake well to help combine the milk solids with the liquid. Pour milk into a medium bowl.
Place peanut butter in a small microwavable bowl and heat for 45 seconds to melt. Whisk melted peanut butter into the coconut milk along with cocoa powder, vanilla and salt.
Add chia seeds and whisk once more. Divide mixture between four glasses or bowls. Cover and refrigerate overnight.
In the morning, garnish with additional melted peanut butter and/or mini chocolate chips or fresh berries if you wish.