Mix the wet ingredients. In a large bowl, stir together the peanut butter, honey (or maple), and vanilla until smooth and creamy.
Add the dry base. Add oats, protein powder, cocoa powder, and salt. Stir with a sturdy spoon or spatula until a thick dough starts to form. It will look crumbly at first—keep going.
Adjust the texture. Add milk 1 tablespoon at a time and mix after each addition.
You’re aiming for a dough that holds together when pressed but isn’t sticky. Depending on your protein powder and peanut butter, you may need more or less liquid.
Fold in the goodies. Stir in mini chocolate chips. If the dough feels too soft, pop it in the fridge for 10 minutes to firm up.
Roll into balls. Scoop about 1–1.5 tablespoons of dough per ball.
Roll between your palms to form smooth, bite-sized rounds. You should get 18–22 balls, depending on size.
Chill to set. Place the balls on a parchment-lined plate or tray and refrigerate for at least 20–30 minutes to set. They’ll firm up and become easier to store.
Enjoy or store. Eat right away or transfer to an airtight container for later.
See storage tips below.