Crush the Mini Eggs. Place Cadbury Mini Eggs in a zip-lock bag and crush with a rolling pin into a mix of small chunks and crumbs. Set aside.
Mix wet ingredients. In a large bowl, stir together the peanut butter, honey (or maple syrup), and 1 tablespoon of milk until smooth and well combined.
Add dry ingredients. Fold in the oats, protein powder, salt, and mini chocolate chips. Mix until a soft dough forms. If the mixture feels too dry, add the remaining tablespoon of milk.
Fold in the Mini Eggs. Gently stir the crushed Mini Eggs into the dough. Do not overmix — you want to see the colorful pieces throughout.
Chill the dough. Cover the bowl and refrigerate for 20–30 minutes. This makes the dough easier to roll and prevents sticking.
Roll into balls. Using a tablespoon or cookie scoop, portion the dough and roll between your palms into smooth balls (about 1.5 inches in diameter).
Set and chill. Place on a parchment-lined tray and refrigerate for 15–20 minutes to firm up.
Serve or store. Enjoy immediately or transfer to an airtight container. See storage notes below.