After delivering Azure Blueprint to help setting up Azure governance, a new PowerShell module is now available to manage these blueprints.
You can get it by running the command (as always use the Run As Administrator when starting the PowerShell prompt)
Install-Module -Name Az.Blueprint
With this first release you can get existing blueprints, create/delete one(s) and update it
Hopefully this will be included soon in the more complete Azure PowerShell module instead of having it separately