In a jar or container, add oats, chia seeds, protein powder, cocoa powder, and a pinch of salt. Stir to combine.
Add yogurt, milk, vanilla, and sweetener.
Mix thoroughly until no dry pockets remain. It should look a bit loose; chia will thicken it.
Taste and adjust sweetness. If your protein powder is sweet, you may not need much syrup.
Cover and refrigerate for at least 3 hours, ideally overnight, to thicken and chill.
In the morning, stir well. If it’s too thick, add a splash of milk.
If it’s thin, let it sit 10 more minutes.
Top with fruit, nut butter, or a sprinkle of cacao nibs, and serve cold.