Grind cashews until flour like in a blender at low speed or food processor. Repeat with oats (can be done together if using a processor).
Combine cashew flour, oat flour and protein powder (or flour) in a bowl. Add maple syrup, vanilla and chocolate chips and mix with a spoon until combined. If the mixture is too dry, add milk a little at a time. Mix to a dough.
Roll spoonfuls of dough into balls.
Refrigerate any uneaten balls.