Two pre-made hard-boiled eggs with a pinch of salt. Pure protein, grab-and-go, no thinking required.
Batch-boil eggs on a good day so they are ready when you need them. Buy pre-peeled if peeling feels like too much. Eat one, wait 10 minutes, then decide on the second.
Buy pre-cooked and peeled eggs from the supermarket if you want truly zero effort. They keep for about a week in the fridge.