With this. https://github.com/salesforce/policy_sentry https://github.com/salesforce/policy_sentry (Disclaimer: I am the author) Not one step exactly, but it

With this. https://github.com/salesforce/policy_sentry https://github.com/salesforce/policy_sentry (Disclaimer: I am the author) Not one step exactly, but it is by far the easiest way to write least privilege IAM policies. Otherwise, it becomes impossible to ensure IAM policies are written securely and at scale. This way, all custom IAM policies are written with the exact same methodology.