Warm the peanut butter slightly. If it’s thick, microwave for 10–15 seconds so it mixes easily.
Mix the base. In a bowl or large jar, whisk milk, peanut butter, protein powder, cocoa powder, maple syrup, vanilla, and salt until smooth. Break up any clumps.
Add chia seeds. Stir in chia seeds thoroughly, making sure they’re evenly dispersed so the pudding sets evenly.
Rest and stir. Let the mixture sit for 10 minutes, then stir again to prevent clumping.
Chill to set. Cover and refrigerate for at least 2 hours, or overnight for a thicker, creamier texture.
Adjust texture. If it’s too thick, whisk in a splash of milk.
If it’s too thin, add 1 teaspoon more chia seeds and chill another 20–30 minutes.
Serve and top. Spoon into bowls or jars and add your favorite toppings.