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Or you can use the https://packagebuilder.herokuapp.com/ app. Now, be careful - this is a community built project that logs into your org. I would probably only do it on a dev sandbox. But it does a nice job. Or there is a chrome extension Force.com Migration Tool Package Creator that will work in conjunction with Workbench to create a package.xml. I have not tried it tough. I have tried Salesforce Package.xml Generator Extension which is a VSCode extension, it is adequate and does the job. But it is really slow. It also shows you all the MDAPI metadata that you don’t need to download separately. Eg downloading objects gives you fields, list views, validation rules, record types etc by default, you don’t need them explicitly in your package.xml. There is also Salesforce Inspector Extension that will download your full metadata and give you a Package.xml in the Zip file. This is probably the easiest.
I am still waiting for something built-in, or really easy like MavensMate was.
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