Define the user job
Write the situation, desired progress and current workaround. Features are useful only when they support this job.
Choose one complete journey
A narrow end-to-end workflow teaches more than many disconnected screens. Include the outcome, not only the interface.
Prototype the risky assumption
Test the part most likely to invalidate the idea: comprehension, data availability, integration or willingness to change behaviour.
Set learning criteria
Agree what evidence will justify continuing, changing or stopping. An MVP is a decision instrument, not a smaller version of every future feature.