In a mixing bowl or jar, add the milk, chocolate protein powder, cocoa powder, sweetener, vanilla extract, and salt.
Whisk thoroughly until the mixture is smooth and free of lumps. This step is important to prevent protein powder clumping later.
Add the chia seeds to the mixture and whisk again until evenly distributed.
Let the mixture rest for 5 minutes, then whisk once more to prevent the chia seeds from settling at the bottom.
Cover the bowl or seal the jar and place it in the refrigerator.
Chill for at least 3–4 hours, or overnight, until the pudding thickens completely.
Once set, stir the pudding. If it’s too thick, add a small splash of milk and mix until desired consistency is reached.
Spoon the pudding into serving glasses or bowls.
Add toppings such as whipped cream, cocoa powder, or chocolate shavings if desired.
Serve chilled.