Stir oats and protein powder together in a large bowl.
Add peanut butter, honey, chia seeds, and milk. Mix until a thick dough forms.
Add another splash of milk if the mix is too crumbly to roll.
Roll into 1-inch laddoo and chill 30 minutes.
Notes
Plant-based protein powders vary in absorbency — adjust milk as needed.Use unflavoured pea protein plus 1/2 tsp vanilla if you dislike sweet protein powders.Vegan swap — maple syrup and plant milk; use vegan protein powder.Store in the fridge up to 5 days — protein powder flavour is best fresh.