What’s the easiest way to give a PowerShell script a user-friendly interface?

If the goal is a web-based interface, PowerShell Universal is worth looking at. It can wrap scripts in simple web pages or expose them as APIs, which may be easier for users than distributing a desktop GUI. Just make sure the security and permissions are designed properly.

First, clarify what your boss means by “UI.” If users only need to see an alert or choose between a couple of options, a simple PowerShell prompt or menu with clear formatting may be enough. Building a full graphical application could add a lot of complexity for very little benefit.

There are tutorials for building PowerShell GUIs with Windows Forms and WPF, so following one of those is a good way to learn. Code-generation tools can also produce a starting point, but have the tool explain every section and test the result carefully rather than treating the generated code as finished.

PowerShell doesn’t naturally convert into a polished GUI. You can use Windows Forms or WPF, and tools such as Visual Studio Community can help you design the windows and controls, but you’ll still need to learn event handling and how the interface connects to the script. For a small desktop alert, Windows Forms is probably the most approachable starting point.