Add chocolate milk, protein powder, and PBfit to Ninja Creami container. Whisk or froth together until smooth.
Freeze for 24 hours.
Place the frozen container in Ninja Creami. Press the 'Ice Cream' button; remove. If powdery, add 1-2 Tbsp more of chocolate milk.
Place back in Ninja Creami. Press the 'Respin' button; remove. Respin another time if needed.
Create a small hole in the center; add 3 Reese's mini cups. Place back in Ninja Creami; press the 'Mix In' button. Remove. Crumble 3 additional Mini Reese's on top.
Enjoy your Ninja Creami Peanut Butter Chocolate Protein Ice Cream!