A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Try these options:
Option 1, Windows Game Bar, is probably easiest. It is already part of Windows 11, requires no additional software, and can record the PowerPoint window along with your microphone. Press Windows + Alt + R to start and stop recording. The video is normally saved under Videos > Captures. One important limitation is that Game Bar is designed primarily for recording an app, so it is less flexible than a general-purpose screen recorder.
Option 2, Clipchamp, is better if you want a more polished recording, particularly if you want your webcam image displayed while you present (there is a free trial version). It can record the screen, microphone, and camera together, and you can subsequently edit the recording. More at https://clipchamp.com/en/windows-video-editor/
For what you described, I would start with Game Bar. It is the least complicated approach: open PowerPoint, start the Slide Show, press Windows + Alt + R, and give your presentation.
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hth
Marcin