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Even without finding a new app, Automator might be able to do that in an options-limited fashion using a "Get Specified Finder Actions" or "Get Folder Contents" action followed by an "Encode to MPEG Audio" action.

(Apple's Compressor can definitely do it, but it might be overkill for you.)
 
I had reason to recently find an audio converter. Used to have Switch but had difficulties with it.
Searching around found "To Audio Converter" its free and worked well. Did a batch of records from flac to mp3
See screenshot.
 

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Just updating this thread, now I'm discovering many of my tried and tested apps are no longer supported under Catalina... I couldn't get the MediaHuman app to recognise any flac files, so I just tried Switch, downloaded from the App Store, and it's working well to convert some flac files to mp3.
 
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