What is your go-to high-protein breakfast when short of time?

It can be difficult to prepare a decent breakfast when you are rushing in the morning, especially if you are trying to get enough protein.

What is your usual quick option? Eggs, Greek yoghurt, protein shakes, overnight oats, leftovers from the night before or something else?

It would be good to gather a few simple ideas that require little preparation and keep you going until lunchtime.