Whisk the dry ingredients: In a medium bowl, whisk cocoa powder, protein powder, and a pinch of salt to break up any clumps.
Add the wet base: Stir in Greek yogurt, milk, vanilla, and sweetener.
Mix until mostly smooth.
Blend in the peanut butter: Add peanut butter and whisk vigorously. If it’s thick or clumpy, use an immersion blender or regular blender for 20–30 seconds.
Adjust thickness: For a thicker pudding, stir in chia seeds or quick oats. For a lighter texture, add a splash more milk.
Taste and tweak: Add more sweetener for balance or another teaspoon of cocoa for a darker chocolate note.
A tiny extra pinch of salt can make the flavors pop.
Chill to set: Cover and chill for at least 30–60 minutes. Chilling firms it up and melds the flavors.
Serve: Spoon into bowls or jars and add your favorite toppings. Enjoy cold.