In a large bowl, stir together oats, coconut, chia seeds, cocoa powder, protein powder (if using), cinnamon, and salt.
Add nut butter, honey/maple, vanilla, and peppermint extract. Use a sturdy spoon or clean hands to mix. If the mixture feels dry or crumbly, add milk 1 tablespoon at a time until it sticks when pressed.
Stir in mini chocolate chips and any festive add-ins like cacao nibs or crushed candy cane.
Pop the bowl into the fridge for 10–15 minutes. This firms the mixture and makes rolling easier.
Scoop 1–1.5 tablespoons per bite and roll into tight balls. Aim for about 18–22 bites depending on size.
Roll in extra shredded coconut or finely crushed freeze-dried raspberries for a snowy, North Pole look.
Place on a parchment-lined tray and chill for 20 minutes to set before packing.