Whisk the base: In a medium bowl, whisk the Greek yogurt, milk, maple syrup (or honey), vanilla, and salt until smooth.
Add chia seeds: Sprinkle in the chia seeds and whisk thoroughly. Make sure no clumps remain.
Let it thicken briefly: Set the bowl aside for 10 minutes, then whisk again to break up any settling seeds.
Portion and chill: Divide the mixture into 2–3 jars or containers. Cover and refrigerate at least 4 hours, ideally overnight, until thick and pudding-like.
Stir and top: In the morning, give it a quick stir.
Add fruit, nuts, or a spoonful of nut butter. Taste and adjust sweetness if needed.
Serve cold: Enjoy straight from the fridge or let it sit for 10 minutes to soften if using very thick yogurt.