Add ingredients to a jar: In a 12–16 oz jar or container, combine the milk, sweetener, vanilla, and salt. Stir well.
Stir in chia seeds: Sprinkle chia seeds over the liquid, then whisk or stir vigorously for 30–45 seconds to prevent clumping.
Rest and stir again: Let the mixture rest for 5–10 minutes, then stir once more to break up any clusters.
Chill to thicken: Cover and refrigerate for at least 2 hours, ideally overnight, until it reaches a pudding-like texture.
Adjust thickness: If it’s too thick, stir in a splash of milk. If it’s too thin, add 1 teaspoon more chia, stir, and chill another 20–30 minutes.
Add toppings and serve: Keep toppings light and purposeful—berries, cinnamon, or a few chopped nuts add flavor without many extra calories.