Gather all your ingredients: chia seeds, milk or milk alternative, cocoa powder, protein powder, sweetener, and vanilla extract.
In a medium-sized bowl, combine the chia seeds, cocoa powder, and protein powder. Mix well.
In a separate bowl, mix the milk, sweetener, and vanilla extract until well combined.
Gradually pour the wet mixture into the dry ingredients, stirring continuously to avoid lumps. Let it sit for 5 minutes.
Transfer the pudding into serving containers, cover, and refrigerate for at least 120 minutes.
Once set, stir the pudding and serve with your favorite toppings.