Whisk the liquids and protein powder. In a bowl or jar, add 1 cup milk and 1 scoop vanilla protein powder. Whisk or shake until completely smooth with no clumps.
Add chia seeds. Stir in 3 tablespoons chia seeds. Mix well so seeds are evenly dispersed.
Let it sit, then stir again. Rest for 10 minutes, then stir once more to break up any settling or clumping.
Chill. Cover and refrigerate for at least 2 hours, or overnight for the thickest texture.
Adjust texture. If it’s too thick, add a splash of milk and stir.
If it’s thin, add 1 teaspoon more chia, stir, and chill 20–30 minutes.
Serve. Enjoy as is, or top with fresh fruit, nut butter, granola, or a sprinkle of cinnamon.