Looks like VC gasket. Run your finger (carefully), along the valve cover gasket area and you'll likely find the area it is leaking. Other alternative is there is a vent line from the front diff that runs up into the engine compartment around there (or is it the transmission vent line, I forget). Could be spewing fluid up there by that's highly unlikely as the transmission would have to be grossly overfilled.

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual