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My 2015 has about 60k miles, and just recently has a misfire on start, but runs fine after. It's also from a cold start and idles just fine (and drives fine too)

Any ideas what it might be? Made an appointment for new plugs but Mercedes books over 1 month out where I live.
 

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I would try some Marvel Mystery Oil first by putting about 4 oz. into the fuel tank and then filling it up if you do not have a CEL. Then take the car for a drive on a high speed drive for about 20 miles and hopefully this will clear your misfire.
 

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My 2015 has about 60k miles, and just recently has a misfire on start, but runs fine after. It's also from a cold start and idles just fine (and drives fine too)

Any ideas what it might be? Made an appointment for new plugs but Mercedes books over 1 month out where I live.
Check the coil packs. I had one that went bad on me and caused the same issue.
 

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60k. Have you replaced the spark plugs. Often more of an issue on a cold start than a hot start.
 

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Last time I had a misfire on a cold start I changed the spark plugs and that resolved it. If your plugs haven't been changed in a while I'd start there first. I only use products like MMO after making sure my problem isn't something simple like plugs.
 
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