Start with the wet base: In a jar or bowl, whisk the milk, Greek yogurt, protein powder, Nutella, vanilla, and maple syrup until smooth.
If your protein powder clumps, sift it in or whisk a little at a time.
Add the dry ingredients: Stir in the oats, chia seeds, and a small pinch of salt. Mix until everything is well coated and evenly distributed.
Adjust thickness now: If it looks very thick, splash in a bit more milk. If it’s very thin, add a teaspoon more chia or a few extra oats.
Chill: Cover and refrigerate at least 4 hours, but overnight is best for a creamy, pudding-like texture.
Finish and serve: In the morning, give it a good stir.
Add toppings like sliced banana and chopped hazelnuts for crunch, plus a tiny drizzle of warm Nutella if you want extra flair.